A period-correct battery cranks the high-compression 469-cubic-inch Pontiac engine. Bore/Stroke: 4.150/4.00-in Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor Optional was the obligatory four-speed manual or new-for-1965 Turbo-Hyramatic three-speed automatic. 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. in. Get the best deals on Engines & Engine Parts for 1966 Pontiac GTO when you shop the largest online selection at eBay.com. designs, the SD-455 was a much improved engine. 068) to 301/313 (No. This installment includes the assembly and parts selection up to the long-block. Though production cars only got the two hood air inlets the name was retained. Open pressure: 282 pounds at 1.100-in 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. It's well documented that an internal combustion engine is nothing more than an air pump. The 1966 Pontiac GTO was also the first car to replace the aluminum grille with plastic mesh-pattern inserts. [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. This new material had stronger alloys in the iron. Pontiac successfully competed against more-expensive inline four-cylinder models with their inline flathead six-cylinder engines. The 2+2 package was first offered as a $291 option on Catalina hardtops and convertibles in 1964. 1966: 421: 9782611 (late) 1967-1969. 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. Example: A128 = January 12, 19*8. Email Email. Carb: (3) Rochester two-barrels PMD (V8) - Stamped on right front side of block or beneath production . It was rated at 250hp (186kW) with 8.6:1 compression and 260hp (194kW) at 10.25:1 compression. The 421 SD produced up . This was to ensure there was enough fuel to cool the cast offset dished pistons. 1966 Pontiac Ventura Specifications. V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. Stock Pontiac Engine Specs. Rear Main Cap. Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. VEHICLE TYPE . 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. The other major difference between the "typical" Pontiac engine of the time was that this one used the large . and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). Timing chain: LPC, double rollerINDUCTION This S/D retains the original "Traction Master" traction bars and two-bar spinners on the original 8 . The piston weighs 630 grams with the pin versus the stock piston and pin weight of 790 grams. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. 744) and a new valve spring package with dampers to positively control valve action. Regarding Crower's upgrade suggestions for its . Preparation: Cook, bead blast, magnaflux, bore, true decks, align bore Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. It was rated at 475hp (354kW). 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). 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. We and our partners use cookies to Store and/or access information on a device. Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. Pontiac produced the 421 V8 engine from 1961 to 1968. The 1979 Firebird model line was the last year for the Pontiac 400, and by this point not only was it required with the 4-speed manual transmission, it also required the WS6 Special Handling Package as mandatory equipment. By 1963, the more powerful Pontiac 421 was beginning to outshine the 389 for performance applications. 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. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. 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." Under the leadership of chief engineers Pete Estes and John DeLorean, Pontiac engine guru Malcolm "Mac" McKellar (1920-2011) and crew developed the Super Duty 389 and 421 NASCAR engines that embarrassed the Fords and Chevrolets at Daytona. 1968 Pontiac GTO 428 / Royal Bobcat. Information and specs for the Pontiac 421 V8 engine. Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! Read. The "670" head was a 1967-only casting, and the only PMD head to have a closed chamber with the new 14 degree valve angle. 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. All W72 equipped Trans Ams featured the "T/A 6.6" shaker decal. 5 January 2007. The engine was available in all full-size Pontiacs. Compression jumped from 11.0:1 to 12.0:1, while other tweaks increased maximum shift points by 500 rpm, to a screaming 6400 rpm. It was rated 180hp (134kW) @ 4600rpm and 264lbft (358Nm) @ 2400rpm with a two-barrel carburetor, 200hp (149kW) @ 4600rpm and 278lbft (377Nm) @ 2800rpm with the four-barrel carburetor. Retainers: Crower steel Spiral clip . Starting at the bottom, Jim will employ lighter and stronger parts in the reciprocating assembly, as evidenced by the choice of Howards billet rods and forged Icon pistons. Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. 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. HP = flow at 28 in/H2O x 0.257 x # of cylinders. 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 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. All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. Simply called "Ram Air" by Pontiac[17] it was the first in a series of engines available from Pontiac as regular production line options and officially called Ram Air. Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch V-8. In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. There are no manual transmission equipped Trans Ams that came factory with the standard L78 400 motor in 1977-79. The 428 was factory installed in large cars only. Wearing a revised GM B-body semi-fastback shape, the 2+2 option delivered a 421-cu.in. The 389 V8 was first introduced by Pontiac in 1959. superior_queens (3,035) 100%. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. Year. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. Plans were made to produce Firebirds and GTOs with advertised ratings of 355hp (265kW) and 375hp (280kW) respectively but concerns about emissions, the response of the automobile safety lobby, and the warranty implications of a high-revving street engine led to cancellation of the program.[why? ENGINE. Mods: Intake port match, valve bowl blend, improved short-turn radius It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". - P.B. 301 Turbo (210hp, 157kW), (with the 5th VIN character being a "T". Note the tri-color Pontiac Ventura upholstery. 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. Thus in March 1973 Pontiac eliminated a timing solenoid that gave full vacuum advance and disabled the EGR valve in high gear after a period of time that happened to exceed the running time of the EPA testing cycle. 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 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. 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. . 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. The Ram Air II also incorporated the first computer-designed camshaft. Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). CO2, . 3.75. 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. In 1967, the Pontiac 2+2 became an option on the . This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. 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). It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. These same heads were also used on the 1964 GTO 389 tri-power engines. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. It was rated at 310hp (231kW) @ 4800rpm and 400lbft (542Nm) @ 3,000rpm on 10.5:1 compression. For 1967 only Pontiac called this engine the Quadra-Power 428. When fitted with other high-airflow components, it produced a good balance of low-end torque and higher-RPM power. 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. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455". Head bolts do not pull on the cylinder wall causing distortion. Block casting # 9773157. Transistorized ignition was available. of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. With an identical bore and stroke of 4+116in (103.2mm) and 3+34in (95.3mm) it was precisely half the displacement of the 389 and shared numerous parts with the V8,[1] yet weighed considerably more than half as the engine lower half and block casting were not simply divided down the middle. 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 . 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. The camshaft was the HO cam with 288/301 duration. Pontiac V8 Engine Tune-Up and Torque Specifications. Duration at .050: 247/252-deg Update your shipping location. ENGINE TYPE Water-cooled V-8, cast iron block and head Displacement 428 in 3, 7015 cm 3 Power 390 hp @ 5200 rpm It would later become known colloquially as the "Ram Air III", though Pontiac never called it by that name. With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. On premium fuel, it was rated at 207 hp at 5200 rpm and . For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). The engines feature a cast-iron block and head and two valves per cylinder. Here is another number to ponder: 370 hp. 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. A three-speed stick was standard; a four-speed and automatic cost extra. Engine Specifications. Manage Settings Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. . Factory heavy-duty high-pressure oil pump and eight-quart sump, four-bolt main bearing caps with Moraine aluminum bearings, and #1110976 dual-point distributor without vacuum advance. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. Preparation: Disassemble, check ball seat for width, spring tension, plate clearanceHEADS RamAir 4 Motor Price $15500.00. From a performance perspective, the 2+2 is pretty impressive. The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. This 1966 Pontiac 2+2 Convertible is a beautifully restored big-block convertible that is ready for some boulevard cruising! Pontiac offered this to the public as a streetable version of the 421 SD. 1963 - 389 SD Code 543797. Not long before the model year introduction, Pontiac management decided that the entire line would be V8-powered. [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). 1966 Pontiac Engine Data Location Of Engine Code: (Six-Cyl) - On cylinder head-to-block contact surface behind oil filter pipe. . Modified versions of this engine were extensively used in NASCAR stock car racing and drag racing competition.
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