The shaker wore the decals "455 H.O." Only about 400 were produced before the fuel injection system was quietly dropped. Besides a variety of displacements, the Pontiac V-8 block saw a number of other changes over the years, including starter locations, main-journal diameters, engine-mounting points, and . 3.75. For those who may not be familiar with the equation, here it is again: Preparation: Weigh, soap-and-water wash The manuals had Hurst shifters. The 1969 HO 350 HO was equipped with the 400cuin (6.6L)'s large valve heads (# 48's) and the 400 HO camshaft and rated at 330hp (246kW). The 421 SD Tri-Power engine offered during these years produced the highest horsepower of any motor in the Pontiac V8 lineup at 376 bhp. A common misconception made by enthusiasts was the notion that all Pontiac engine equipped Trans Ams featured the "T/A 6.6" decal on the shaker, however, it was exclusive to the W72 engine that was featured on less than half of all Trans Ams made during this period. This installment includes the assembly and parts selection up to the long-block. This test would tend to lend credence to the CAR AND DRIVER and HOT ROD tests of 1973 Super Duty cars with 3.42 gears, no air, and 160lb (73kg) less weight as being representative of production specimens capable of mid to high 13-second passes at 104mph (167km/h). Learn how Classified Ads works . Again, its bore was expanded, this time 0.03in (0.76mm) to 4.1525in (105.47mm). With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. The Pontiac 2+2 is a full size automobile that was manufactured by Pontiac, built on the B-body chassis.It debuted for the 1964 model year as a trim-only option for the Pontiac Catalina, with special door panels, bucket seats with a center console, and exterior badging.Pontiac marketed the 2+2 as the "big brother" to the popular Pontiac GTO.. Beginning in 1965 the name Catalina was no longer . Engine, horsepower, torque, dimensions and mechanical details for the 1966 Pontiac Catalina. Though a change of camshaft would delay production, Pontiac decided to change camshaft, employing one with identical timing to the 744 camshaft, which had been used in the 400 Ram Air(aka Ram Air III) engine with manual transmissions. 540306 featured 1.92/1.66-inch (49/42mm) valves and was carried over from the previous model year, production stopped in March 1962 and then casting No. This was to ensure there was enough fuel to cool the cast offset dished pistons. The heads were a new design featuring siamesed intake ports. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. 1966 Engine Codes ; Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WA : 389: 8.6:1: 256: Manual: 91: 254: 2 bbl: WB . Like the 326, it was offered in both 2-barrel and 4-barrel versions. The valve angle was reduced from 17 degrees to 14 degrees for better breathing. Headers: Hooker Super Comp (for dyno test) Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. The 421 engine is available only with related heavy-duty driveline components. Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. This engine was first offered in 1967 as the top engine option in full-size Pontiacs. The W72 Performance Package also included an upgrade to the rear differential ratio, setting the rear gear ratio to 3.23 for all 1977 and 1979 W72 Firebirds, with the exception being 3.42 for 4-speed equipped W72 Firebirds in 1978 only. This same camshaft was also used in Pontiac's 19691970 RA IV production cars. The 1968 Ram Air II remained at 400 cu. Regarding Crower's upgrade suggestions for its camshaft, Jim pretty much has it covered. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. These muscle car profiles include photos and specifications for each model: For related car information, go to these articles: Please copy/paste the following text to properly cite this HowStuffWorks.com article: the Auto Editors of Consumer Guide The air cleaners look like those used on the top dog 376 gross HP 421 CI engine but there was also a lesser 356 HP version available too. The standard head seen on an L78 400 Pontiac was the low compression 6x8 head, while the 6x4 head seen on the W72 had hardened valve seats for a higher RPM operating range, improved air flow, and higher compression. One of the key modifications over the standard 301 4-barrel was the 301 Turbo block. The engines feature a cast-iron block and head and two valves per cylinder. The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). 1. The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). 1966 Pontiac Complete 389 Engine YC code 290 HP Block Catalina . Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. Rods: Howard's billet 4340 certified steel, stock 6.625-in, floating pins Rear Main Cap. Tri-power engine rated at 376 hp. Using an equation the author has provided in HPP many timesmost recently with The Mule engine seriesit was revealed that around 228.6-cfm flow though the intake port of the cylinder head is required to produce the desired 470 hp. ENGINE TYPE Water-cooled V-8, cast iron block and head Displacement 428 in 3, 7015 cm 3 Power 390 hp @ 5200 rpm or choose Generic to see kits that might fit a . Pontiac ignited the classic muscle car era with a stroke of marketing genius. 301 4-barrel 'W72' or 'ESC' (170hp, 127kW) (with the 5th character of the VIN being a "W" for 1979-1980 and the 8th for 1981). The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. This new material had stronger alloys in the iron. 287. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. By 1965 and 1966 the same combinations would be rated at 338hp (252kW) for the 4bbl and the two Tri-Power versions would be rated at 356hp (265kW) and the H-O version at 376hp (280kW). Based in part on designs for the "short deck" 303cuin (5.0L) engine designed for the 1970 racing season, it had a shorter deck than the big V8, and used thin-wall castings to reduce weight. Rings: LPC (Liberty Performance Components) premium moly, standard tension However, the RA II was limited to a 1.50:1 rocker ratio, while the RA IV used a 1.65:1 ratio, which yielded significantly greater total lift and, therefore, superior flow and power. Hewing to GM's standing edict limiting engine size to 400 cu in for its midsize and smaller cars, the 360hp (268kW) (underrated),[citation needed] the 400 cubic inch Ram Air V-8 was the most powerful and advanced option available in the 1967 GTO and Firebird. A period-correct battery cranks the high-compression 469-cubic-inch Pontiac engine. Also, a rumored 75 cars were built with non-Super Duty 421 engines rated at 320 bhp. Read. Size cfm: Total flow, 1,050 cfm Preparation: Install in rod, torque, measure ID It was factory rated at 366hp at 5,400 RPM and 445lbs.ft. Math, not gasoline, makes horsepower under the hood of a Pontiac. The 389 would remain the standard Pontiac V8 engine through 1966, offered in a bewildering variety of outputs ranging from 215 to 368hp (160 to 274kW). According to the engineers who worked on the project, the SOHC 421 engines produced around 625hp and were capable of turning 7,000 rpm. In 1973 a further refined and even stronger but less powerful version, the Super Duty (SD) engine, was planned for Firebird, Grand Am, Le Mans (GTO), and Grand Prix models. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. Unfortunately, that's what happened with the 1963 Pontiac Super Duty 421. The 1970 '455 HO' was a conventional "D" port engine. 1965 Pontiac LeMans GTO Mecum. Given that, it was no accident that the leader in intermediate muscle also put together the finest full-size performance machine -- the 1966 Pontiac 2+2. At the request of Ed Cole, general manager of Chevrolet, the layout was also used by the Chevrolet V8 released in 1955, an exception to the customary GM policy of allowing a division one year of exclusive use of an internally developed advance. While all this sounds great, remember the engine will have to retain the small 1.92-inch intake valve because chamber space is too tight for larger ones. [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. A total of 1,808 Ram Air IV production cars were built over its 2-year production. Detroit, however, was reluctant to relinquish its time-tested biggest-car/best-engine formula. Horsepower: See Part 2 Muscle Cars. In 1967 the 421 was enlarged to 426.61cuin (7.0L) by increasing its bore to 4.12in (104.6mm). The W72 package was a standalone option, and although was discounted when ordered in conjunction with the Y82/Y84/Y88 Special Appearance package, did not come included with Special Edition Trans Ams, it remained an extra cost option. Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor. Preparation: Magnaflux, check for equal stroke and index, grind, polish 0.010-in The other major difference between the "typical" Pontiac engine of the time was that this one used the large . The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. The head design was incorporated from the earlier 1970's 350 Pontiac heads, and could satisfy emissions in all states except for high-altitude emissions states and California. [7] Though listed as slightly less powerful than some high-performance iterations of the 400 (such as the 366hp (273kW) Ram-Air), the 455 had 500lbft (678Nm) of torque, 55 more lbft (75Nm). Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 It would later become known colloquially as the "Ram Air III", though Pontiac never called it by that name. Like the 421, the 428 used a large-journal crankshaft, but externally it was the same size as all Pontiac V-8s of that era (the later 301 used a shorter deck height). 1966 Pontiac Catalina technical specifications and data. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. The stroke increased to 4.21-inch (106.9mm). Crank: Original '64 421 The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. Though production cars only got the two hood air inlets the name was retained. . The Ram Air IV heads had 1/8" taller intake ports, larger intake port volume with more airflow, yet shared the Ram Air II round exhaust ports. The short-deck block and different intake ports also required the design of a new intake manifold. Not where most enthusiasts go first. Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. For the 1978 model year, Pontiac re-incorporated the earlier thicker cast cast engine block denoted by the cast number 418988 and a "XX" cast into the side of the block. Along with the HO it also had Pontiac's famous cast-iron "headers", which were much better at reducing backpressure than the regular manifolds. However, the 1959 389 engines had the generator in front of the heads with reverse flow cooling still in use. Brand: Fel-Pro head and intake/ SCE pan and timing cover Head ID Location For 1970 the Trans Am was the only Firebird available with the Ram Air IV, and 88 were produced during the abbreviated 1970 F-body production run. Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch V-8. Although it is much different from the original 1955-vintage Pontiac V-8 powerplant, the 301 has the distinction of being the last true Pontiac V-8 engine, as Pontiac ceased production of these engines effective April 1, 1981. The consent submitted will only be used for data processing originating from this website. On the invoicing for the 1979 model year Firebirds, they had the option listed as L78, however, every 1979 400 equipped car received a W72 engine. The 421 SD became factory installed in 1962 and in 1963 a street version became available from the factory with a dual four-barrel or three two-barrel Tri-Power carburetion. Now select an engine model (if applicable) -- Pontiac Engine Models -- All Pontiac Kits 151 301 326 350 3800 389 4-cylinder 400 421 428 455 Brodix Heads Edelbrock Heads Iron Duke L67 Pro Stock Dart Heads Pro Stock Heads Ram Air Runner Heads Super Duty Generic V8. All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. Valves: Competition Products stainless steel, 1.92 /1.66-in Standard in the Firebird Trans Am, it was still a rare engine. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . If you've been thinking about cruising the local boulevard in a classy convertible, but find yourself longing for the power under the hood that only a muscle car provides, perhaps it's time to take another long look at Pontiac's restyled 1965 Bonneville convertible. Pontiac offered this to the public as a streetable version of the 421 SD. which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. - P.Top - Correct Exterior/Interior. For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. A big chunk of the appeal of the 1965 and '66 2+2 was the fact that you got a standard 421 under the hood: The 338hp, four-barrel 421-cu.in. Every torque specification should be in this table, however if there is one missing, please Contact Me and I will get you the spec and add it to the table. It remained on the same platform, but for the 1966 models, it became a different Pontiac series. In 1977 the 400-cubic-inch (6.6L) T/A 6.6, (RPO code W72) was created to fulfil the performance engine gap in the Pontiac line-up. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS ( SAE gross . It featured a smaller bore of 3+34in (95.3mm) coupled with the same 3in (76.2mm) stroke of the 301 (same bore and stroke used by Chevrolet when the first small block motor was introduced in 1955). It was renamed 428 HO for 1968. As Pontiac's 1967 performance brochure said, "You can add the Ram Air induction hood scoop and new high output cam and valve springs to the Quadra-Power 400 for better top end breathing." Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. Valve guides: K-Line, liners Melling PN M54D with 60 psi spring, made 70 psi at 6,000 rpm with 30W oil . The compression ratio will be 10.6:1. 1966 Pontiac GTO. The engine compartment of this concours Catalina is beautifully finished. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). The 389 was the standard engine on the GTO up to 1966. 1966 Pontiac Catalina Specifications and Production. Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). The 287 was an "oversquare" engine with a bore and stroke of 3+34in 3+14in (95.3mm 82.6mm), for a total displacement of 287.2cuin (4.7L). Engine Oil: 95 ft-lbs. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. It included a new camshaft with duration increased from 288/302 (No. Manage Settings By early 1979, orders for the W72 package were being rejected by dealers as they supply had run dry. Standard ratio with the 400 was 3.55:1(except 3.36:1 in Firebird for 1969) regardless of transmission(3.23:1 for cars with air conditioning). If you enjoy the videos and would like to Sponsor me on Patreon, my Creator link is https://www.patreon.com/MyCarStoryWithLouOn "My Car Story" we're in Huntl. At the end of 1976, Pontiac was no longer able to continue production of the 455 (7.5 L) V8 motor due to the tightening emissions requirements. Carb: (3) Rochester two-barrels PMD A mechanical system built by Rochester, it was similar in principle, but not identical, to the contemporary Chevrolet "fuelie". The concept car Pontiac Strato-Streak was used to introduce the V8 and in later years the engine was installed in Pontiac products. Intake: 218 cfm at 0.500-in It was the same engine as the '67-'68 400 HO[18] but for 1969 and 1970 it included a driver-selectable outside air induction system on the GTO(it was a separate option on Firebird), with the hood vents opened and closed using a knob located under the dash, below and to the right of the steering wheel, its bracket labeled "RAM AIR". Along with a cam swap it boosted horsepower from 325 hp with the four-barrel carb to 348 hp in '64. These motors were built mainly for NASCAR or other racing purposes and were equipped with all the extra racing goodies that people were looking for. In 1961 and 1962 they were available with either one 4 barrel carburetor or a dual 4 barrel carburetor setup depending on whether the buyer wanted to head to the racetrack or drag strip. For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). Reductions in reciprocating weight free up horsepower. . View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. PONTIAC : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . Valve seals: U.S. Seal It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. cam specs out at 215/225-degrees duration at 0.050 and has just 0.407/0.407 lift with the factory 1.50:1 rockers. HP = flow at 28 in/H2O x 0.257 x # of cylinders. Update your shipping location. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. The inlets were all well within the boundary layer that exists close to the surface, so all of these systems would more accurately be described as "outside air induction" systems, benefiting from the intake of cooler, and thus denser, outside air versus the comparatively hotter and less dense air under the car's hood. The valve size increased as well, to 2.11in (53.6mm) intake and 1.77in (45.0mm) exhaust valves on high-performance heads. cam specs out at 215/225-degrees duration at 0.050 and has just 0.407/0.407 lift with the factory 1.50:1 rockers. Open pressure: 282 pounds at 1.100-in The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. A higher-output version was offered, called the 326 HO (High Output). for 1980, and the 8th being a "T" for 1981). Pontiac engineers tested their 269cuin (4.4L) V8 in 1949 or 1950 against an OHV Oldsmobile Rocket V8 303cuin (5.0L) downsized to 270cuin (4.4L). It is a known fact that a person's pupils dilate slightly when viewing something pleasant to the eyes. pontiac engine decoder year code c/i hp tran carb car misc 1962 13b 421 3 m 2 x 4 full super duty 1962 13u 421 4 m 2 x 4 full super duty 1962 bu 421 4 m 2 x 4 full super duty . Fuel line size: 38-inch, 516-inch to carburetor / 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . This may have been propagated by the only authorized company that is licensed to reproduce these decals not including the "6.6 LITRE" in the Trans Am decal kits, and only including "T/A 6.6" with no extra cost. With the 1964-1967 Pontiac Catalina 2+2, Pontiac achieved a combination of power, road-holding, and fine styling superior to any other big Pontiac, and most of the competition's models besides. On this Wikipedia the language links are at the top of the page across from the article title. This money bought a potent 389 V-8 with 267-283 bhp . While not related to the 400 W72, the concept was the same. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. Offered on select models from 1957 through 1966, Pontiac's Tri-Power induction system added a new dimension of performance to the General Motors brandand a colorful new term to the hot rodder's vocabulary. The four-barrel version with 10.5:1 compression upped horsepower to a healthy 285. . The goal of making a Pontiac Hemi succeeded but the engine was never produced. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. The 421 used the same 4.120-inch bore but used the 4.0-inch crank from the 421 it replaced. Only 157 Ram Air IV Firebirds, including 55 Trans Ams, were built for 1969. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. Ram Air induction was optional in the GTO, though power ratings were unchanged. 1967 was the last year for closed-chambered heads. The four-barrel version, set up for sustained high speeds, had 390 hp. Greater throughput mixed with the proper amount of fuel and ignited at the ideal time for the flame to expand against the piston will result in more power. Pontiac's V8s share the same 6.625in (168.3mm) connecting rod length, with the exceptions of the later short deck 301, 265, and 303 Ram Air V. Most Pontiac V8s had an overall length (to the edge of the water pump pulley) of 28.25in (718mm), an overall width of 27in (690mm), and a height (not including air cleaner) of 31in (790mm). 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). [9], The W72 engine was standard in all 1977 Pontiac Can Ams (bar the 1977 Can Ams sold in California/High Altitude states which received the L80 Oldsmobile 403) and was optional in all 1977-79 Pontiac Firebird Formula and Trans Am models. From a performance perspective, the 2+2 is pretty impressive. He thinks the stock exhaust flow of 180 cfm will suffice for this build. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. For 1956 the V8 was bored out to 3.9375in (100.01mm), increasing displacement to 316.6cuin (5.2L). He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. The 338-bhp four-barrel was the base engine. Collector size: 3.00-inGASKETS The 421 also marked the end of the option for a forged-steel crankshaft. A larger 4in (101.6mm) ram air flex duct to the air cleaner from the left-hand fender, specific carburettor calibration for the Rochester Quadrajet, a "T/A 4.9" callout on the shaker, 60 psi oil pump, and cam similar in grind to the 220hp (164kW) 400 from the 19781979 model year were also included. "1966 Pontiac 2+2" Ultimately Pontiac produced only 295 1973 SD-455 Firebirds (252 Trans Am, 43 Formula). Only one is known to survive today. One version of the engine featured camshafts driven off the front of the engine, another design had the cams driven by gears off the back of the engine. Are you thinking of buying a 2007 muscle car, or any other car? 1962 - 389 SD Code 544127. This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. Located at the back of the engine near the Distributor. Email Email. The Catalina was the base intermediate-sized Pontiac resting on a 121-inch wheelbase that it shared with the Safari and the Grand Prix. Cam was a #541596 McKellar No. Here are features on more than 100, Muscle cars created their own culture. Prices ranged from $2,760 to $3,220 . The engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. Power ratings increased accordingly: Several dealer-installed camshafts were optional to increase power further to 317hp (236kW). In 1970 the casting number #9799914 Ram Air 400 4-bolt main block also used the 4-bolt main caps on Ram Air applications. With some WS6 "Trans Am Special Performance Package" bundles in 1978, the W72 engine was incorporated with the WS6 option group and not listed on the dealer order invoice. 10 with 308/320 degrees of duration and 0.445/0.447-inch lift (11.3/11.4mm) with 1.65:1-ratio rocker arms and solid lifters, special #529238 forged-steel connecting rods, forged aluminum 4.09-inch (104mm) bore Mickey Thompson pistons, #542990 forged-steel crankshaft with a 4-inch (101.6mm) stroke and 3+14-inch (82.6mm) diameter main journals. Mechanical advance: 36-deg at 3,200 rpm The heart of the build, a code 45B 1964 421 HO 370 HP manual trans 4-bolt main block, all Pontiac 421 engines without exception had 4-bolt main caps. Thus, the quest to find 100 hp in a 421 started on the flow bench, before a wrench or machine tool touched any part of the 49-year-old engine. The 428 was factory installed in large cars only. Royal Pontiac developed the prototype of the package on their 1965 GTO drag car and Pontiac picked up the idea and in August 1965 Pontiac offered the new Fresh Air package to dealers consisting of the parts and instructions needed to make the hood scoop functional, including the metal tub to mount to the carburetors and rubber gasket to seal it to the underside of the hood. 421 CID V8 - 4BBL - Automatic - P.S. Its cast "670" heads had taller valve spring heights than the standard D-port heads, and the only 14-degree valve angle closed combustion chamber making these heads unique. Total Timing: 36-deg BTDC Type Size Carb Horse Power Tourqe; Tri-Power: 389ci: 3x2bbl: 360 hp @ 5200 rpm: 424 lb-ft @ 3600 rpm: Base 8 . Pontiac Engine Torque Specs Pontiac Engine Torque Specs. [22]. However, the engine used in these Trans Ams was the same regular production 455 taken from the big body cars Pontiac was producing, and output 200 HP with a torque rating of 330lbft at 2,000 rpm.[13]. These heads can be distinguished from 6x8 heads through a small stamped "4" on the top of the front boss. In 1967, the cylinder head design was improved for the 400 4-barrel engine. Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. This was a completely stock car on loan from a private owner for the test. Standard only for the Pontiac Bonneville was Pontiac's first-ever fuel injection system. Only about 2000 like this one were built with 4 speed Muncie transmissions. This was the only Poncho with standard 421-cid power. For 1971, Pontiac introduced another High Output (HO) version with standard internal parts, a reinforced block with four-bolt main bearing caps, and improved cylinder head design with 18-inch taller (3.2mm) intake ports and special round exhaust ports for better breathing, yet still making just 335hp (250kW) gross (or 310hp (231kW) in the more accurate SAE Net system). Maximum RPM (high-RPM engine): over 8000 rpm, Engine weight: estimated 550lb (249kg) complete, Power: estimated 640hp (477kW) at 7500rpm, This page was last edited on 30 January 2023, at 13:15. What was most interesting about the 421 engine in the beginning was that it was a dealer installed option only known as the SD (Super Duty) 421. 1966 Pontiac Catalina . Engine Oil: 120 ft-lbs. This is it! Other dimensional factors such as the wheel base, curb weight and length were largely unchanged.
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