Total Timing: 36-deg BTDC It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. The external dimensions of all their V8s, from 326455cuin (5.37.5L) were the same. 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. Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. Piston pins: Icon, SAE 1016 to 1022 It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. 287. All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . This engine was first offered in 1967 as the top engine option in full-size Pontiacs. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. All Rights Reserved. Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust 1967 - 400 Ram Air or 428 Code 670. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. Optional was the obligatory four-speed manual or new-for-1965 Turbo-Hyramatic three-speed automatic. 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. Jim told HPP, "Since I was a young man in the '60s, I always thought how great it would be to find a true 100hp in a legendary 421 Tri-Power setup that retained its iron heads and intake. Unique exterior features included "2+2" badges, twin lens taillamps, and chrome bodyside gills; Pontiac's famous eight-lug aluminum wheels were the ultimate optional touch. It requires a compression ratio of at least 10.25:1. 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). The W72 offered many improvements over the standard L78 400 Pontiac. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. For 1965, however, the 2+2 became a bonafide muscle car. VEHICLE TYPE . engine, dual exhausts, three-speed manual transmission, Hurst shifter, 3.42:1 rear gears, heavy-duty suspension, bucket seats, upgraded upholstery, carpet, emblems, "Decor" louvers, pinstripes, lower . The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. Spiral clip The 421 badging was standard on the 2+2, the 421 H.O. [citation needed] It was the first engine that incorporated Pontiac's round-port head design in a production vehicle, however the intake port was the same as other D-port heads, leaving a head which exhaust port could nearly match the intake at high valve lifts. Intake: 218 cfm at 0.500-in Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION Update your shipping location. 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. Retainers: Crower steel 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 421 SD Tri-Power engine offered during these years produced the highest horsepower of any motor in the Pontiac V8 lineup at 376 bhp. . 301 Turbo (210hp, 157kW), (with the 5th VIN character being a "T". Pontiac's initial plans were to use a camshaft with specs identical to the 041 Ram Air IV camshaft, but testing showed emissions, while technically compliant, did not have "cushion" to satisfy Pontiac's emissions engineers, to avoid production variation leading to any non-compliant engines being produced and sold. and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). Over the years he has amassed a library of data from investing in metallurgical testing with a well-respected laboratory. As Pontiac still wanted to offer a performance motor to compete in the performance market, they looked back to the 400 Pontiac and how it could be improved to offer greater performance while meeting CAFE standards. However, in the June 1974 issue of SUPER STOCK AND DRAG ILLUSTRATED, a new 1974 Trans Am with the SD-455 motor ran 14.25 @ 101mph (163km/h). On premium fuel, it was rated at 207 hp at 5200 rpm and . 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. The manuals had Hurst shifters. Shipping to: 98837. In 1963 Pontiac dropped the Buick division built 215 cu. It could only be ordered with a TH200 automatic transmission and a 2bbl configuration. The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. The 1971 Pontiac 455 HO was Pontiac's first engine to receive a special 800cuft/min (23m3/min) Rochester Quadra-jet carburetor with specific jetting. The company says engines running this cam benefit from headers, cylinder-head port work, a large-cfm carb, and an ignition upgrade. SELLER Glendale, Arizona 85305. The four-barrel 400 was a popular performance option for many of Pontiac's cars. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. From 1955 through 1959, the Pontiac V8 was also used in some GMC pick-up trucks. 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. 1968 - 400 Ram Air I and 428HO Code 37" Ram Air I and. Tri-power engine rated at 376 hp. Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. Here is another number to ponder: 370 hp. Though never factory-installed in any car, the ultimate engine of the Ram Air line of engines was the tunnel-port Ram Air V. In 1969 Pontiac created four versions of the Ram Air V engine: a 303cuin (5.0L) short deck version for SCCA Trans-Am racing, a 366cuin (6.0L) variant for NASCAR, a 400cuin (6.6L) version for street use in GTOs and Firebirds, as well as a 428cuin (7.0L) adaptation for drag racing. . Preparation: Magnaflux, check for equal stroke and index, grind, polish 0.010-in It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. 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. 400 Ram Air (1969) / Ram Air (1970), aka Ram Air III, Learn how and when to remove these template messages, Learn how and when to remove this template message, "Tested: 1968 Pontiac GTO 428 / Royal Bobcat", "1969 Pontiac Grand Prix 428 specifications | technical data | performance | fuel economy | emissions | dimensions | horsepower | torque | weight", "Muscle Car Horsepower How Exaggerated Was It? That's the factory rating of the legendary 421 H.O. Still, it was the strongest American engine offered that year. In the Firebird Ram Air induction for the 400 HO was a separate option for 1969(included with Trans Am) and included with the engine(optional in Formula; included with Trans Am) in 1970. 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. 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 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. Two tri-power 421s were optional, one with 356 bhp, the other with 376. It shared the 389's 3+34in (95.3mm) stroke, but its bore was 3.78in (96.0mm) for a displacement of 336.66cuin (5.5L). [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. 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 Catalina was the base intermediate-sized Pontiac resting on a 121-inch wheelbase that it shared with the Safari and the Grand Prix. Here are my top six rationales for admiring the 1966 GP. It also could hold its own against a range of performance cars. Casting No. 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. The engines feature a cast-iron block and head and two valves per cylinder. Compression ratio was a modest 8.00:1, with valve diameters of 1.781in (45.2mm) (intake) and 1+12in (38mm) (exhaust). 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. Fuel line size: 38-inch, 516-inch to carburetor All W72 equipped Trans Ams featured the "T/A 6.6" shaker decal. [citation needed]. As Stock drag racing heated up at the dawn of the Sixties, the factories were serving up a constant stream of engines, transmissions and lightweight body par. Despite their work, the division's conservative management saw no immediate need to replace the Pontiac Straight-8 until later in the 1950s. It was removed from the design for the 1960 model year because designers moved the generator and the power steering pump from atop the front of the engine down to the front of the heads to accommodate a lower hoodline. Muscle Cars. Read. 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 main upgrade for the engine was the ESC, (Electronic Spark Control)[15] which provided slightly more power at 170hp (127kW) with 4.9L (299cuin) for the 19801981 model years. 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. When fitted with other high-airflow components, it produced a good balance of low-end torque and higher-RPM power. PONTIAC : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . . Required airflow at 28 in/H2O = HP/ # of cylinders/0.257 The mighty Pontiac 421 was a star on the drag strip and a super nova on the Nascar tracks of the first half of the 60s. Engine Specifications. [2] This was the engine installed in the Pontiac Executive line of large cars[3] and its largest station wagon, the Pontiac Safari. Only about 2000 like this one were built with 4 speed Muncie transmissions. 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]. By 1963 Pontiac decided it was time to 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. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. 1968 - 400 Ram Air II Round Port Code 96. Original plans called for a forged crankshaft, although actual production SD455s received nodular-iron crankshafts with minor enhancements. An evolution of the RA IV and H.O. As with all other Pontiac V8 motors that evolved from the 316 V8, the 421 was simply a bored out and stroked version of the popular Pontiac 389 V8. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. . By early 1979, orders for the W72 package were being rejected by dealers as they supply had run dry. Head ID Location Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. [5] It was rated at 360hp (268kW), but the Grand Prix with the same specifications was rated at 370hp (276kW).[6]. 1966 Pontiac GTO. 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. Distributor: '61 Delco cast-iron with direct oiling Standard in the Firebird Trans Am, it was still a rare engine. The camshaft was also revised to have a slightly higher duration, the carburettor jets tuned and a dual exhaust was implemented allowing the power to increase to 220hp (223PS; 164kW) at 4000 rpm and 320lbft (434Nm) of torque at 2800 rpm. This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. 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. Engine Block Date Code. High output Pontiac V8 Cylinder Heads. Oil pan: 8-quart with extended pick-up, fabricated retention clamp The 400 HO was offered as an option for 1967-1970 for GTO and 1968-1970 for Firebird. The 421 engine is available only with related heavy-duty driveline components. The Pontiac 2+2 featured a 6.9 L V8 engine, heavy-duty front springs, dual exhaust and distinctive exterior body design. 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." 1962 421 super duty motor Price $30000.00. All Pontiac Catalina 2-Door Sedan versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish 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. With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. 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). Rocker studs: ARP special 34-in bottom Available only in the 1973 and 1974 Firebird Formula and Trans Am, the SD-455 consisted of a strengthened cylinder block that included 4-bolt main bearings and additional material in various locations for improved strength. The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. The Ram Air IV also used a lightweight aluminum intake-manifold that produced a weight savings of 1015lb (4.56.8kg). Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. (imp.) Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm It shared the 4.121in (104.7mm) bore of the 400, but with a 2.84in (72.1mm) stroke for a displacement of 303cuin (5.0L). From a performance perspective, the 2+2 is pretty impressive. Crank: Original '64 421 The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. Open pressure: 282 pounds at 1.100-in None of Pontiac's Ram Air engines actually enjoyed any true ram air effect.
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