A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. The 421 Super Duty had been the first of these, and their large bore and stoke made them popular in NHRA and NASCAR competition throughout the '60s. Pushrods: LPC chrome moly in. Standard only for the Pontiac Bonneville was Pontiac's first-ever fuel injection system. Given how late in the model year it was, Pontiac decided not to incur the costs of recertifying the SD-455 for other models other than the Firebird. In 1969, Pontiac also used a revised crankshaft out of a Pearlitic malleable-iron, although it still used the "N" casting letter. The last was the 421 HO and included a high-output camshaft and valve train. One of the key modifications over the standard 301 4-barrel was the 301 Turbo block. This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). 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. Free shipping on many items | Browse your favorite brands | affordable prices. Again, its bore was expanded, this time 0.03in (0.76mm) to 4.1525in (105.47mm). This was the only Poncho with standard 421-cid power. Price $30000.00. 1962 Pontiac Catalina, Royal Bobcat Super Duty 421. Pontiac offered this to the public as a streetable version of the 421 SD. Chamber: Closed, special to PMD, 70 cc The 670 heads were used until May 1967 when they were upgraded to become the "97" heads, which were then replaced late in the model year by the "997" heads which incorporated the upgrades of the "97" heads. Primary tube diameter: 1.75-in Note the tri-color Pontiac Ventura upholstery. Preparation: Install in rod, torque, measure ID The crankshafts were also unique in the fact that they featured only two counter weights instead of the usual five and also featured lightened connecting rod journals. This is the original car featured in the May 1962 issue of Motor Trend Magazine that was modified by Royal Pontiac and driven by Jim Wangers. Are you thinking of buying a 2007 muscle car, or any other car? 1966 Pontiac Ventura Specifications. . The goal of making a Pontiac Hemi succeeded but the engine was never produced. Stock Pontiac Engine Specs. Along with proper parts selection, accurate machining and assembly are also important. RamAir 4 Motor Price $15500.00. 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. / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . Type Size Carb Horse Power Tourqe; Tri-Power: 389ci: 3x2bbl: 360 hp @ 5200 rpm: 424 lb-ft @ 3600 rpm: Base 8 . The cylinder heads on the 400 CID version had an intake port volume of 290cc (17.70cuin), nearly twice the size of a typical standard D-port Pontiac head - and flowed in the area of 315cuft/min (8.9m3/min) @ 0.8in (20mm) valve lift; in the realm of the NASCAR-dominating Chrysler 426 Hemi. Buckets and a console were added to the top-line Catalina interior, which could be optioned with a sport steering wheel and instrumentation that included a tachometer and oil-pressure gauge. The external dimensions of all their V8s, from 326455cuin (5.37.5L) were the same. It requires a compression ratio of at least 10.25:1. The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. The short-deck block and different intake ports also required the design of a new intake manifold. From 1969 though 1970, the Ram Air IV was available in both A-Body (GTO, including Judge) and F-body (Firebird, including Trans Am) form. Splayed main caps, head bolts tie into main caps. The 389 V8 was first introduced by Pontiac in 1959. 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. Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke However, compression ratios were cut dramatically, marking the beginning of the end of the muscle car era. The 1972 455 HO was available in the Firebird (optional in Formula; standard in Trans Am) and 2-door LeMans (including those with the GTO option) and LeMans Sport convertible. But the "Ram Air" 400 also mandated steep 4.33:1 gears(or 3.90:1 in Firebird), making the Quadra-Power 400 (400 HO) the top practical street engine option for most drivers. It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. Engine, horsepower, torque, dimensions and mechanical details for the 1966 Pontiac Catalina. More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. In addition to the more refined cylinder heads, block casting reinforcements in the lifter galley and main bearing oil pan rail area, it had forged connecting rods with larger 716-inch-diameter (11mm) bolts. To determine horsepower from airflow, invert the equation: Offered from 1967 to 1969, it produced 360 and 376hp (268 and 280kW) in 1967, 375 and 390hp (280 and 291kW) in 1968 and 360,370 and 390hp (268,276 and 291kW) in 1969. The results showed Pontiac that an L-head simply couldn't compete with an overhead valve engine. The 1979 W72/WS6 equipped Trans Am was considered to be one of the overall best performing cars of the decade due to having a powerplant that produced more power than any other competitor on the market at the time with handling equipment to supplement the performance.[12]. The horsepower ratings of this era were often dubious, with engines rated higher or lower in output for advertising, political, or insurance purposes. Federal emissions standards and the drive towards "corporate" engines shared among all GM divisions led to the progressive demise of the Pontiac V8 through the late 1970s. 1965 Pontiac LeMans GTO Mecum. The engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust 3.75. Reductions in reciprocating weight free up horsepower. Deck Height: 10.215-in This was a completely stock car on loan from a private owner for the test. This engine was first offered in 1967 as the top engine option in full-size Pontiacs. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Unusual for a major automaker, Pontiac did not have the customary "small-block" and "big-block" engine families common to other GM divisions, Ford, and Chrysler. Balancer: Original PMD rebuilt by Damper Doctor 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). The rod weighs 751 grams versus the stock rod at 958 grams. To learn about it, read. / 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . Pontiac RAIII/IV Engine parts collection Price $14000.00. Regarding Crower's upgrade suggestions for its . 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. 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. Pontiac successfully competed against more-expensive inline four-cylinder models with their inline flathead six-cylinder engines. Valve seals: U.S. Seal The shaker wore the decals "455 H.O." 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. According to the June 2019 issue of Muscle car Review magazine, during dyno testing performed during that era, the National Hot Rod Association (NHRA) rated this Pontiac W72 400 T/A 6.6 engine at 260 to 280 net horsepower instead of the 220-hp rating published by Pontiac. The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455". It used the "744" camshaft (301-313) in the earlier manual trans versions, later downgraded to the "068" version, and the 288/302 duration cam with automatic transmission. 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. Shipping to: 98837. Pontiac produced the 421 V8 engine from 1961 to 1968. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. The Pontiac 389 engine was produced from 1959 to 1966, and has a 4.06" bore and 3.75" stroke. The 1968 Ram Air II remained at 400 cu. By comparison, the factory 421 H.O. . Tri Power engine however was optional. Well, gaze upon these numbersa 421ci Pontiac with Tri-Power carburetion. The 338-bhp four-barrel was the base engine. Ram Air induction was optional in the GTO, though power ratings were unchanged. 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). They came up with a 269-cubic-inch (4.4L) L-head design. A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars. 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. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). The 421 engine is available only with related heavy-duty driveline components. 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. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. moniker from the shaker due to the disappointing public approval as the motor was not deemed to be "High Output". 1966: 421: 9782611 (late) 1967-1969. The XS-code 389 was still rated at 360bhp at 5,200 rpm, same as the more common WS-coded Tri-Power 389, but performance was noticeably improved on acceleration runs. Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm Carb: (3) Rochester two-barrels PMD It would later become known colloquially as the "Ram Air III", though Pontiac never called it by that name. Exhaust: 180 cfm at 0.500-in Lift: 0.515/0.525 with 1.6:1 rockers 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 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. The 301.6cuin (4.9L) 301 was offered from 1977 to 1981 and also installed in other GM cars during those years. Engine Displacement: 432 ci In 1970 the casting number #9799914 Ram Air 400 4-bolt main block also used the 4-bolt main caps on Ram Air applications. They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. $6.49 shipping. 421 CID V8 - 4BBL - Automatic - P.S. 1966 Pontiac Catalina technical specifications and data. An innovative design feature was mounting the rocker arms on ball pivots on studs set into the cylinder head, rather than using a separate rocker shaft. Ultimately Pontiac produced only 295 1973 SD-455 Firebirds (252 Trans Am, 43 Formula). Head bolts do not pull on the cylinder wall causing distortion. All W72 equipped Trans Ams featured the "T/A 6.6" shaker decal. It had 2-bolt main bearing caps in 1969, but went to a block similar to the Ram Air IV's in 1969 that was drilled for 4-bolt main bearing caps (but used a cast crank and cast rods). In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. 1963 - 389 SD Code 543797. For 1956 the V8 was bored out to 3.9375in (100.01mm), increasing displacement to 316.6cuin (5.2L). Also bowing in 1967 was the new Firebird, which had the . Often called the "Ram Air III", this engine was officially called the "400 Ram Air" for 1969 and then simply "Ram Air" for the 1970 model year. 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. Engine Block Date Code. Continue with Recommended Cookies. A higher-output four-barrel carburetor version was offered, called the 326 HO (High Output). Make way for one of the baddest muscle cars of all time, the, An all-aluminum, race-proven V-8 defined the rare and wicked, The engine is what gives a muscle car its flamboyant personality. Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch V-8. The Pontiac 301 EC (Electronic Controls) version offered in 1981 produced 155hp (116kW) and 245lbft (332Nm), although it's rumoured that the actual output was closer to 170hp (127kW). Bore/Stroke ratio: 1.04:1 Email Email. in., again available only in the GTO and Firebird. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. Keepers: Comp Cams race locks In addition, a shallower spherical-wedge combustion chamber moved the tuliped valve heads .040" closer to the piston at TDC, improving mixture draw considerably during the intake stroke. The 455 was used through 1976 when it, as with many other large displacement engines, was discontinued as manufacturers moved to smaller, more efficient models, even in their full size car lines. Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. The W72 offered many improvements over the standard L78 400 Pontiac. The 1966 Pontiac GTO was also the first car to replace the aluminum grille with plastic mesh-pattern inserts. Engine Oil: 120 ft-lbs. CO2, . It was rated at 366bhp (273kW) (gross) in the GTO version. designs, the SD-455 was a much improved engine. In 1969 the 350 HO was upgraded again with the addition of the 400 HO cam, commonly referred to by enthusiasts as the 068 cam. Known as GM's performance-oriented division, Pontiac lived up to the hype by creating the first Muscle Car and kicking off the Muscle Car era. The Ram Air IV also used a lightweight aluminum intake-manifold that produced a weight savings of 1015lb (4.56.8kg). Regarding Crower's upgrade suggestions for its camshaft, Jim pretty much has it covered. What is important is the total timing, the . Horsepower: See Part 2 Valves: Competition Products stainless steel, 1.92 /1.66-in in. Engine Specifications. Crower identifies this cam as a Level 4, which means it provides strong midrange and top-end power for heavily modified engines. For '65, the 421-cid V-8 became a standard part of the option package, and for '66, Pontiac made the 2+2 a separate model, still based on the Catalina two-door hardtop or convertible.Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. Crank: Original '64 421 Transistorized ignition was available. 1966 yk 421 376 a 3x2 1967 zg 230 165 a 1 1967 zm 230 165 a 1 1967 zk 230 165 3 m 1 1967 zs 230 165 3 m 1 . HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. Both Randy and Stan were aware of the . 1. The fuel-injected engine became an option on any Pontiac model, carrying a staggering price tag of $500 (almost 15% of the car's base price). Whether all were installed in GTOs is unknown. [4] It was replaced by the 455 for the 1970 model year. Example: A128 = January 12, 19*8. The engines feature a cast-iron block and head and two valves per cylinder. "1966 Pontiac 2+2" Piston pins: Icon, SAE 1016 to 1022 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). Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). The "455 HO" moniker took on a whole new meaning with the introduction of the 1971 model year; Intended as a low compression progression from the previous years Ram Air IV engine, all 1971 455 HO engines used a heavy duty 4 bolt main block, round port cylinder heads (casting #197; with 8.4: compression), "Ram Air" style exhaust manifolds, and a two-part aluminum intake manifold. The 2+2 option package arrived for 1965, giving the Catalina a performance persona and credentials to match. These are general guidelines. The initial press cars that were given to the various enthusiast magazines (e.g. Like the 326, it was offered in both 2-barrel and 4-barrel versions. Required airflow at 28 in/H2O = HP/ # of cylinders/0.257 Pontiac V8 Engine Codes and Specifications. Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 The Ram Air IV used the Ram Air II's camshaft but lift in the Ram Air IV was increased to 0.52in (13mm) thanks to the use of 1.65 ratio rocker arms (vs 1.50). ft. After the SD-455 was certified with the new cam, it was production-ready but was then further delayed by the EPA mandating Pontiac recertify all of its engines when the EPA discovered that part-throttle emissions exceeded the limits. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. Update your shipping location. Retainers: Crower steel It included a new camshaft with duration increased from 288/302 (No. HOT ROD and CAR AND DRIVER) were fitted with the Ram Air IV-spec camshaft and functional hood scoops - a fact that has been confirmed by several Pontiac sources. 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 W72 was only available for a very short time, with the majority of 1979 model year W72 Firebirds ordered in late 1978. . Casting No. True Pontiac engines were designed and built in Detroitnot on a computer, but often by GI-bill-educated engineers who grew up working with their hands and now had a slide rule in their pocket instead of a greasy rag. 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. This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. 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. Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. 068) to 301/313 (No. 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). The 421 also marked the end of the option for a forged-steel crankshaft. This is it! NASCAR race cars embody the muscle car philosophy of power. It featured 3+14in (82.6mm) main journals (which the legendary Smokey Yunick reputedly left Pontiac's engineering department over). SPECIFICATIONS. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. engine for 1963 is reported to be putting out 500 ft-lbs torque at 4,200 rpm and . In 1967 the 421 was enlarged to 426.61cuin (7.0L) by increasing its bore to 4.12in (104.6mm). The engines feature a cast-iron block and head and two valves per cylinder. Mechanical advance: 36-deg at 3,200 rpm The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. The 301 Turbo was unique since it had a beefier block than the 197779 versions (which carried on in the non-turbo versions in 1980 and 1981), a very mild camshaft with 0.35in (8.9mm) lift and 250 degrees gross duration, a 60psi (4.1bar) oil pump to ensure adequate oil to the oil-cooled Garrett TBO-305 Turbocharger, a rolled fillet crankshaft, a fully baffled oil pan, and a specific 800cuft/min (23m3/min) Quadrajet carburetor. The tri-power equipped XS-code 389 was shipped with the Ram Air pan in the trunk, and the dealer had to fit it and cut out the underside of the hood scoop to make it functional. Most Pontiac engines were painted light blue. 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). 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. Along with a cam swap it boosted horsepower from 325 hp with the four-barrel carb to 348 hp in '64. 1968 - 400 Ram Air II Round Port Code 96. The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. Here are features on more than 100, Muscle cars created their own culture. To learn everything you need to know about car engines, see. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". Prices ranged from $2,760 to $3,220 . While not related to the 400 W72, the concept was the same. Pontiac Engine Torque Specifications. For a few more ponies through better oil control, a factory full-length windage tray will be added, since Pontiac didn't use one on this engine originally. A total of 1,808 Ram Air IV production cars were built over its 2-year production. This installment includes the assembly and parts selection up to the long-block. However, it can easily be determined by examining the cost price of the option, where the package excluding the W72 engine cost $251, and with the engine, cost extra at $324.[10]. The 421 badging was standard on the 2+2, the 421 H.O. 1967 - 400 Ram Air or 428 Code 670. See profiles, photos, and specifications of, Muscle cars came in many shapes and sizes. (imp.) The consent submitted will only be used for data processing originating from this website. V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. 301 Turbo (210hp, 157kW), (with the 5th VIN character being a "T". Preparation: Magnaflux, check for equal stroke and index, grind, polish 0.010-in The 2+2 package was first offered as a $291 option on Catalina hardtops and convertibles in 1964. [citation needed]. 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. Head ID Location The other major difference between the "typical" Pontiac engine of the time was that this one used the large . Also added was the #48 casting number heads with a 68cc (4.15cuin) chamber for higher compression, along with larger 2.11 and 1.77in (54 and 45mm) valves. All 1980 Trans Ams received this engine as standard with the option to delete this engine choice as a credit option for the standard L37 301. This had extra-rich "DX" secondary metering rods and a remote vacuum source for the primary metering rod enrichment circuit to allow the Power Enrichment Vacuum Regulator (PEVR) to release the primary metering rods to move to the up position (enrichment) anytime during boosted conditions. "Armasteel" was a trademark of pearlitic malleable iron developed by GM's Saginaw Metal Casting Operations around 1936, which was referred to as "locking ball" cast-iron, as opposed to the "flaking" type found in other engines. 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). By comparison, the factory 421 H.O. Effectively, Pontiac's V8s were all small blocks, sharing the same connecting rod length 6.625 in (168.3mm) (except for the later short deck 301 and 265 produced in the late 1970s and early 1980s before Pontiac adopted universal GM engines). 5 January 2007. Only about 400 were produced before the fuel injection system was quietly dropped. Secondary: Front and rear #70 With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. The compression ratio will be 10.6:1. Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). It added '421' engine badges on the front fenders, 2+2 insignia on the deck lid and rear fenders, and simulated louvers behind the front wheel cutouts. Unfortunately, that's what happened with the 1963 Pontiac Super Duty 421. ENGINE. Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. The next 1 or 2 numbers represent the date, and the last number is the year. The 1963 Catalina two-door sports sedan pictured here showcases the 421 H.O. Detroit, however, was reluctant to relinquish its time-tested biggest-car/best-engine formula. Price $15500.00. It also could hold its own against a range of performance cars. 1962 421 super duty motor Price $30000.00. Rod/Stroke ratio: 1.65:1BOTTOM END 18 watchers The 421 SD Tri . Pontiac differed from other GM Divisions and most other manufacturers in producing only a single small block V8, rather than adding a larger big block to its line-up. Block description: '64 421ci #157 and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). Centerline: 110-deg 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.
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