Spiral clip Here is another number to ponder: 370 hp. [19], Parts for Ram Air V engines are not readily available. A set of Hooker Super Comp headers will be used on the dyno, and Jim is porting the stock heads to increase intake-port flow by 30 cfm. 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. So large are the intake ports that the pushrods run through the center of each port via pressed-in tubes, in addition to streamlined airfoils over the tubes themselves to improve port shape, and increase flow velocity. We and our partners use cookies to Store and/or access information on a device. / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . The Catalina was the base intermediate-sized Pontiac resting on a 121-inch wheelbase that it shared with the Safari and the Grand Prix. The 301 Turbo package mandated air conditioning, the THM350 (sometimes referred to as the CBC350 in various literature) non-lockup automatic transmission (THM350C lockup in 1981 Trans Ams), and 3.08 rear axle gearing. for 1980, and the 8th being a "T" for 1981). The V8 engine was introduced for the 1955 model year as the "Strato Streak". The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. Engine displacement is a function of bore and stroke. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. The heads were a new design featuring siamesed intake ports. Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Catalina Vista 421HO Trophy V-8 Tri-Power 4-speed in 1964 the model with 4-door hardtop sedan body and V-8 6902 cm3 / 421.2 cui, 276 kW / 375 PS / 370 hp (max) offered since October 1963 for North America U.S. special version. PONTIAC : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . Unlike previous enlargements of Pontiac V8s, it did not replace the 389. 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. Ram Air induction was optionally available with the 455 HO in the Firebird Formula(standard on Trans Am), GTO (standard with "The Judge" package), and 2-door LeMans Sport when the T41 Endura Styling Option was also ordered. The engine build will be discussed in two parts. Specifications listing with the performance factory . Brand: Crower PN 60311, solid Standard in the Firebird Trans Am, it was still a rare engine. 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. 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. Method used to retain pins in pistons: . Again, its bore was expanded, this time 0.03in (0.76mm) to 4.1525in (105.47mm). 1962 - 389 SD Code 544127. Engine Block Date Code. 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. 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. Some production test cars ran considerably slower and yielded 14-mile (402m) times in the 14.5 second/98mph (158km/h) range in showroom tune (uncited sources)- results that are quite consistent for a car with a curb weight of 3,850 pounds (1,746kg) and the rated 290hp (216kW) SAE NET figure that some sources suggest was "under-rated." This money bought a potent 389 V-8 with 267-283 bhp . Once corrected the SD-455 was recertified and was released for production in late April 1973. / 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. Vacuum advance: Not usedEXHAUST In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. Low-performance and two-barrel applications, the standard engine in full-sized Pontiacs, got 1.96in (49.8mm) intake and 1.66in (42.2mm) exhaust valves and pressed in rocker arm studs. This was the last run for the 455 (7.5 L) motor from Pontiac, and production ceased on the 455 this year as it could no longer meet the emissions requirements any longer. Math, not gasoline, makes horsepower under the hood of a Pontiac. intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. 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. release the 421 V8 officially to the general public and the motor would continue to be available until the end of the 1966 model year. Email Email. SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. The short-deck block and different intake ports also required the design of a new intake manifold. 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 initial press cars that were given to the various enthusiast magazines (e.g. [4] It was replaced by the 455 for the 1970 model year. Crank: Original '64 421 The next 1 or 2 numbers represent the date, and the last number is the year. A new engine was fast-tracked, its relatively late start allowing it to take advantage of developments proven in the Oldsmobile V8 and Cadillac V8. This was the only Poncho with standard 421-cid power. Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch V-8. 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]. However, compression ratios were cut dramatically, marking the beginning of the end of the muscle car era. 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". Coil: GM [2] This was the engine installed in the Pontiac Executive line of large cars[3] and its largest station wagon, the Pontiac Safari. The 428 was increased to 456.12cuin (7,474cc) in 1970. NASCAR race cars embody the muscle car philosophy of power. 1966 Pontiac Catalina technical specifications and data. 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. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. Along with the HO it also had Pontiac's famous cast-iron "headers", which were much better at reducing backpressure than the regular manifolds. 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). 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). From 1959 to 1966 Pontiac continues making improvements. Piston pins: Icon, SAE 1016 to 1022 With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. 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). Pontiac V8 Engine Codes and Specifications. 1963 - 389 SD Code 543797. The 389 was the standard engine on the GTO up to 1966. Not long before the model year introduction, Pontiac management decided that the entire line would be V8-powered. Total Timing: 36-deg BTDC 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. It is a known fact that a person's pupils dilate slightly when viewing something pleasant to the eyes. These same heads were also used on the 1964 GTO 389 tri-power engines. The compression ratio will be 10.6:1. Whether all were installed in GTOs is unknown. All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. (V8) - Stamped on right front side of block or beneath production . [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. [8] All of these improvements provided the W72 with a power rating of 200hp (203PS; 149kW) at 3600 rpm and 325lbft (441Nm) of torque at 2400 rpm, while the standard L78 400 only produced 180hp (182PS; 134kW) at 3600 rpm and 325lbft (441Nm) of torque at 1600 rpm. Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. SPECIFICATIONS. Lifters: Crower solid with EDM oil hole (0.024 inch) Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION 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. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. 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. Only one is known to survive today. Splayed main caps, head bolts tie into main caps. Wearing a revised GM B-body semi-fastback shape, the 2+2 option delivered a 421-cu.in. 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. 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. Detroit, however, was reluctant to relinquish its time-tested biggest-car/best-engine formula. and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). The 421 used the same 4.120-inch bore but used the 4.0-inch crank from the 421 it replaced. Pushrods: LPC chrome moly With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. Year: CU IN: Casting # 1967: 326. Pontiac . Valves: Competition Products stainless steel, 1.92 /1.66-in This engine was first offered in 1967 as the top engine option in full-size Pontiacs. The 455 HO designation made its debut in 1970; Rated at 360 or 370hp (268 or 276kW) (depending on which vehicle it was installed into) & 500lbft (678Nm) of torque, it differed from the regular full sized car 455 by large valve heads with smaller combustion chambers, and a larger camshaft. 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). And it cruised silently and rode with less harshness than muscle intermediates. Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. After outselling Oakland, Pontiac became the sole survivor of the two by 1932. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. Lobe separation angle: 112-deg The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. Pontiac V8 Engine Tune Up Specifications. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. 1966 Pontiac 2+2 $64,995. Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm 1962 Pontiac Catalina, Royal Bobcat Super Duty 421. The 1955-up Pontiac V8 that finally reached the public was an overhead valve engine with cast iron cylinder heads and block and wedge-shaped combustion chambers. The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455". 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. "1966 Pontiac 2+2" Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. designs, the SD-455 was a much improved engine. The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). Bore/Stroke: 4.150/4.00-in During 19511952, Pontiac had 23 287cuin (4.7L) V8-equipped 1953 model production prototypes running tests on the GM proving grounds. CO2, . 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. The 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. 1969 - 400 Ram Air III Code 62. . Sponsored Stories . From 1955 through 1959, the Pontiac V8 was also used in some GMC pick-up trucks. It tips the scales at 3,950lbs. 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). 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. The L75 455 engine continued as an option into the 1976 model year for the Trans Am, however, Pontiac opted to drop the "H.O." Prices ranged from $2,760 to $3,220 . It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. 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 SD-455 motor was listed as an option in dealer brochures for the 1973 Grand Am and LeMans GTO(and planned for the Grand Prix as well) although none were produced for sale. 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. engine for 1963 is reported to be putting out 500 ft-lbs torque at 4,200 rpm and . Setting initial timing at idle with the vacuum advance disconnected will usually fall around 12 to 16 degrees, but that's not really important. All Pontiac Catalina 2-Door Sedan versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. While production of 196970 A-body Ram Air IV cars was low at just 1563 units(759 1969 GTOs including 302 Judges, and 804 1970 GTOs including 397 Judges) 1969 and 1970 model year F-body Ram Air IV cars were even rarer at just 245 total units produced. One of the key modifications over the standard 301 4-barrel was the 301 Turbo block. in. The shaker wore the decals "455 H.O." Are you thinking of buying a 2007 muscle car, or any other car? Well, gaze upon these numbersa 421ci Pontiac with Tri-Power carburetion. Royal Pontiac's engine swap wasn't a new trick for Pontiac. 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. The single four barrel was rated at 333 bhp while the Tri-Power version carried a 348 bhp rating. The Ram Air IV replaced the Ram Air II in 1969. Forged steel 6.625in (168.3mm) rods (Ram Air V style), Large-valve heads (valve diameter): 2.4in (61mm) intake, 2in (51mm) exhaust, Small-valve high-RPM head (valve diameter) 2.19in (56mm) intake, 2in (51mm) exhaust. It was offered in the following forms: For 1957 the V8's stroke was increased to 3.5625in (90.49mm), for a displacement of 347cuin (5.7L). In 1969, Pontiac also used a revised crankshaft out of a Pearlitic malleable-iron, although it still used the "N" casting letter. Pontiac began as a "companion make" to the Oakland division of the General Motors line of automobiles in 1926. 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. The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. 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. Ellingson Motorcars (877) 638-7170. 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. . 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. These heads can be distinguished from 6x8 heads through a small stamped "4" on the top of the front boss. 421 CID V8 - 4BBL - Automatic - P.S. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. The external dimensions of all their V8s, from 326455cuin (5.37.5L) were the same. Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. Engine Specifications. It was rated at 366bhp (273kW) (gross) in the GTO version. This was based on results of over 1 million test miles, which was unheard of at the time. Both used a single two-barrel carburetor. Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish While not related to the 400 W72, the concept was the same. 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. Along with proper parts selection, accurate machining and assembly are also important Model Number: Body/Style Number: Body Type & Seating: Factory Price: . Rear Main Cap. 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). Officially named the Quadra-Power 400 for 1967 and renamed 400 HO for 1968, the 400 HO was first offered for 1967 as the third engine in the GTO line after the automatic-only 400 2-barrel and the standard 400 4-barrel (the 400 HO would not be offered in the Firebird until the 1968 model year). For 1965, however, the 2+2 became a bonafide muscle car. Two different cylinder-head castings were used for the 1962 model year, both with a combustion chamber volume of 68cc (4.15cuin) to produce an 11.0:1 compression ratio. or choose Generic to see kits that might fit a . According to GM mandates horsepower was now rated in net figures as opposed to gross, so on paper the 1972 455 HO appeared to have a significant drop in power, but in fact it was very much the same engine, and performance figures reveal this to be true. The 421 was first availabe in a SD (Super Duty) model that was built for racing. This was to ensure there was enough fuel to cool the cast offset dished pistons. A mechanical system built by Rochester, it was similar in principle, but not identical, to the contemporary Chevrolet "fuelie". Retainers: Crower steel (imp.) Initial advance: 18-deg Transistorized ignition was available. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). In 1968, there was also a 350 "HO" which had increased power with the addition of higher compression #18 heads (#17 and #46 were the most common 2-barrel heads), a four-barrel carburettor and matching intake that was also used on the 400 and 428 engines. 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 . In 1974 it was used in the GTO and was rated at 200hp (149kW) (net). The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. This was the beginning of factory supplied performance items such as 4 bolt main bearings and windage trays to reduce friction from crankcase oil. The crankshaft in the 428 had a "N" cast on them (designating nodular steel) as opposed to the 421's Armasteel. Maximum flow at 28 inches of water 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. They came up with a 269-cubic-inch (4.4L) L-head design. 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. 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. 287. The consent submitted will only be used for data processing originating from this website. When Robert Critchfield took over as general manager in 1952, he launched an ambitious plan to move Pontiac into the upscale, mid-range market occupied by Oldsmobile, and that demanded V8 power. It also sports the four-speed manual, limited . 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. It's well documented that an internal combustion engine is nothing more than an air pump. While the 400 offered excellent power in the GTO (360 horses and 445 lb-ft of torque in 1968), Pontiac turned to what it called 'big journal' engines for the muscle machine's next upgrade. 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. Cougar pulled out of Mustang's shadow with the striped and spoilered 1969 Mercury Cougar Eliminator. 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. Simply put, what good is the power if the engine does not last? 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. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. The 301.6cuin (4.9L) 301 was offered from 1977 to 1981 and also installed in other GM cars during those years. A mere five were built, all with a four-speed transmission. Other dimensional factors such as the wheel base, curb weight and length were largely unchanged. Optional was the obligatory four-speed manual or new-for-1965 Turbo-Hyramatic three-speed automatic. Pontiac's SCCA Trans-Am program was promising, with race-ready engines producing 475hp (354kW) to 525hp (391kW), however the series General Competition Rules required the manufacturer to produce no less than 250 vehicles with the 303. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. 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 . 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. Regarding Crower's upgrade suggestions for its camshaft, Jim pretty much has it covered. Diameter: 516-in A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. 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 V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. Not where most enthusiasts go first. Update your shipping location. Seat pressure: 110 pounds at 1.600-in of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. Located at the back of the engine near the Distributor. Horsepower: See Part 2 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. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. The engine was available in all full-size Pontiacs. One of the key upgrades were the 6x4 heads. 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. Size cfm: Total flow, 1,050 cfm This same camshaft was also used in Pontiac's 19691970 RA IV production cars. Example: A128 = January 12, 19*8. [22]. said the "Pontiac 421 cu. 068) to 301/313 (No. Original plans called for a forged crankshaft, although actual production SD455s received nodular-iron crankshafts with minor enhancements. 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. . Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. Super Duty 421s were back, tougher than ever. Muscle Cars. In 1973 Pontiac started stamping extra numbers (1/4" tall) on their heads.These head numbers represented chamber sizes.They are usually stamped on the machined pads by the valve covers. For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). It was factory rated at 366hp at 5,400 RPM and 445lbs.ft.
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