[5] It was rated at 360hp (268kW), but the Grand Prix with the same specifications was rated at 370hp (276kW).[6]. . All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm In the 1968 Pontiac GTO it was given a 10.75:1 compression ratio and tuned to deliver 360 horsepower and 445 foot-pounds of torque.[2]. Only about 2000 like this one were built with 4 speed Muncie transmissions. Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . Pre-Owned. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. The 400 2-barrel kept the 17 degree valve angles for '67; starting in '68 all Pontiac V8s went to the 14 degree valve angle. SELLER Glendale, Arizona 85305. Prices ranged from $2,760 to $3,220 . The 421SD was available in 1961 as a dealer option or over the counter then in 62 and 63 from the factory, and was fitted with a list of internal modifications designed solely to withstand the abuse of drag racing. This new material had stronger alloys in the iron. For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). The single four barrel was rated at 333 bhp while the Tri-Power version carried a 348 bhp rating. 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. 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). Read. 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. 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. Like the 326, it was offered in both 2-barrel and 4-barrel versions. It featured 3+14in (82.6mm) main journals (which the legendary Smokey Yunick reputedly left Pontiac's engineering department over). 1967 - 400 Ram Air Code 97. / 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . 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). Cam was a #541596 McKellar No. An evolution of the RA IV and H.O. Free shipping on many items | Browse your favorite brands | affordable prices. Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. By 1949 work on a 287cuin (4.7L) OHV V8 had begun, but moved along slowly. 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. 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. [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. 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. It was rated at 250hp (186kW) with 8.6:1 compression and 260hp (194kW) at 10.25:1 compression. Intake manifold: Original '64 PMD tri-power None of Pontiac's Ram Air engines actually enjoyed any true ram air effect. The 400 HO was offered as an option for 1967-1970 for GTO and 1968-1970 for Firebird. In 1967, the Pontiac 2+2 became an option on the . The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. 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]. 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. High output Pontiac V8 Cylinder Heads. Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. Pontiac . 1966 Pontiac Engine Data Location Of Engine Code: (Six-Cyl) - On cylinder head-to-block contact surface behind oil filter pipe. The results showed Pontiac that an L-head simply couldn't compete with an overhead valve engine. Type Size Carb Horse Power Tourqe; Tri-Power: 389ci: 3x2bbl: 360 hp @ 5200 rpm: 424 lb-ft @ 3600 rpm: Base 8 . For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). Primary tube length: approximately 31.00 inches This was underrated at 330hp (246kW). Coil: GM Original plans called for a forged crankshaft, although actual production SD455s received nodular-iron crankshafts with minor enhancements. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. It could only be ordered with a TH200 automatic transmission and a 2bbl configuration. 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. Only 157 Ram Air IV Firebirds, including 55 Trans Ams, were built for 1969. The W72 also featured a camshaft with a higher duration, finer tuned 800cfm Rochester Quadrajet, insulated fuel line, larger 60PSI oil pump, chrome valve covers, a larger harmonic balancer, and the "T/A 6.6" Shaker decal. It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. Retainers: Crower steel The very modest cam, combined with a low-compression ratio of 8.4 (advertised) and 7.9:1 actual resulted in 290hp (216kW) SAE NET. 068) to 301/313 (No. 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. . Valves: Competition Products stainless steel, 1.92 /1.66-in All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. The engines feature a cast-iron block and head and two valves per cylinder. Beginning in 1967 casting nnumbers moved to the rear of the block just behind cylinder #8 . It was rated at 475hp (354kW). The 1970 '455 HO' was a conventional "D" port engine. . Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. 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? The four-barrel version, set up for sustained high speeds, had 390 hp. 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. In 1968 the 326 was replaced by the similarly 389-derived 350, which used a 3+78in (98.4mm) bore and 3+34in (95.3mm) stroke for a total displacement of 353.8cuin (5,798cc). A higher-output version was offered, called the 326 HO (High Output). PONTIAC : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. It tips the scales at 3,950lbs. [4] It was replaced by the 455 for the 1970 model year. Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. The premier SD 421 cylinder head was the late 1962-early 1963 casting #9771980 aka "980", featuring a larger 11.3cuin (185cc) intake port volume, flowing 230cuft/min (6.5m3/min) @ 28in (710mm). Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). Royal Pontiac's engine swap wasn't a new trick for Pontiac. Block description: '64 421ci #157 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. The four-barrel version with 10.5:1 compression upped horsepower to a healthy 285. . A mere five were built, all with a four-speed transmission. Engine displacement is a function of bore and stroke. Pontiac in the 1950s was one of a few US manufacturers that did not regularly identify their engine names and sizes with air-cleaner or valve-cover decals. 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. HP = flow at 28 in/H2O x 0.257 x # of cylinders. 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. This money bought a potent 389 V-8 with 267-283 bhp . Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. 18 watchers Jim Taylor, well-known Pontiac engine builder, had that question on his bucket list for years. The 421 SD produced up . The code consists of 3 or 4 digits. Transistorized ignition was available. First offered as an option in 1963, the 421 HO came in a 4-barrel engine of 320hp (239kW) and one Tri-Power H-O version with a hotter cam and efficient iron exhaust manifolds and rated at 370hp (276kW). Super Duty 421s were back, tougher than ever. It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". Stock Pontiac Engine Specs. The main innovation of the Pontiac engine was reverse-flow cooling and the stamped rocker-arm system, which had been devised by Pontiac engineer Clayton Leach in 1948. In 1964 when the new "A" body intermediates came out there was a new corporate (GM) engine size limitation to anything less than 330cuin (5.4L). HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. . 1962 - 389 SD Code 544127. This was to ensure there was enough fuel to cool the cast offset dished pistons. One of the key upgrades were the 6x4 heads. Head ID Location in. From 1959 to 1966 Pontiac continues making improvements. Bore/Stroke ratio: 1.04:1 The 1981 301 Turbo gained the electronic controls with an O2 sensor, feedback ECM and E4ME Quadrajet providing a slight reduction in output to 205hp (153kW) and 340lbft (461Nm).The 301 Turbo was limited to Trans Am and Formula Firebird production only. 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.