It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. 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. Bore/Stroke ratio: 1.04:1 Pontiac produced the 421 V8 engine from 1961 to 1968. Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor An evolution of the RA IV and H.O. Intake: 218 cfm at 0.500-in Where else will the extra 100 horses come from? Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. However, the 1959 389 engines had the generator in front of the heads with reverse flow cooling still in use. They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. Shipping to: 98837. Whether all were installed in GTOs is unknown. Only about 2000 like this one were built with 4 speed Muncie transmissions. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Year: CU IN: Casting # 1967: 326. Oil pan: 8-quart with extended pick-up, fabricated retention clamp If you've been thinking about cruising the local boulevard in a classy convertible, but find yourself longing for the power under the hood that only a muscle car provides, perhaps it's time to take another long look at Pontiac's restyled 1965 Bonneville convertible. A higher-output version was offered, called the 326 HO (High Output). Price $15500.00. The 428 was increased to 456.12cuin (7,474cc) in 1970. What is important is the total timing, the . 1966 Pontiac Catalina Specifications and Production. Both of these engines were originally dealer-installed options, but since the NHRA moved to limit racing eligibility to factory-available options on cars available to the public, Pontiac made the SD 421 a factory option for 1962, and most of the approximately 164 SD 421 engines were installed in the Catalina, with another 16 being installed in . SELLER Glendale, Arizona 85305. 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. (imp.) Brand: Crower PN 60311, solid 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). All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. 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. 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. Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? street engine. Keepers: Comp Cams race locks By 1963, the more powerful Pontiac 421 was beginning to outshine the 389 for performance applications. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". In the 1960s the popular 389cuin (6.4L) version, which had helped establish the Pontiac GTO as a premier muscle car, was cut in half to produce an unusual, high-torque inline four economy engine, the Trophy 4. For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). 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. Setting initial timing at idle with the vacuum advance disconnected will usually fall around 12 to 16 degrees, but that's not really important. Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. Retainers: Crower steel Intake manifold: Original '64 PMD tri-power (imp.) 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. This was a completely stock car on loan from a private owner for the test. 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. The heart of the build, a code 45B 1964 421 HO 370 HP manual trans 4-bolt main block, all Pontiac 421 engines without exception had 4-bolt main caps. Preparation: Install in rod, torque, measure ID Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke While not related to the 400 W72, the concept was the same. Standard in the Firebird Trans Am, it was still a rare engine. It tips the scales at 3,950lbs. 1966 Pontiac GTO. The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. 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). 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. The external dimensions of all their V8s, from 326455cuin (5.37.5L) were the same. As a result, it was remarkably free of teething problems. Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. Power output ranged from 135hp (101kW) to 170hp (127kW). In 1969, Pontiac also used a revised crankshaft out of a Pearlitic malleable-iron, although it still used the "N" casting letter. 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 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. 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. Again, its bore was expanded, this time 0.03in (0.76mm) to 4.1525in (105.47mm). For 1969-1970 GTO the 400 HO included driver operable Ram Air induction and was renamed "400 Ram Air" for 1969 and just "Ram Air" for 1970. Valve guides: K-Line, liners The stroke increased to 4.21-inch (106.9mm). The compression ratio will be 10.6:1. Sponsored Stories . . Standard only for the Pontiac Bonneville was Pontiac's first-ever fuel injection system. Year. Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . 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. Three two-barrel carburetors, 10.75:1 compression, 290hp (216kW) @ 5000rpm, 375lbft (508Nm) @ 2800rpm. Chamber: Closed, special to PMD, 70 cc This included the ESC (Electronic Spark Control) distributor and controller borrowed from the 301 Turbo, which allowed for higher timing without the penalty of engine damaging pinging or preignition. 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 GTO came with a four-barrel 389 V8 with 335 horsepower. 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 earlier 1975-78 blocks had metal shaved from the journals and bottom end as well as a decrease in the nickel content of the block in an attempt to decrease the overall weight of the vehicle to help alleviate emissions and cost. Wires: NAPA Belden 7 mm Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch V-8. 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. What was most interesting about the 421 engine in the beginning was that it was a dealer installed option only known as the SD (Super Duty) 421. 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. The 389 would remain the standard Pontiac V8 engine through 1966, offered in a bewildering variety of outputs ranging from 215 to 368hp (160 to 274kW). . In 1967, the Pontiac 2+2 became an option on the . A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. Though production cars only got the two hood air inlets the name was retained. Balancer: Original PMD rebuilt by Damper Doctor It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. This S/D retains the original "Traction Master" traction bars and two-bar spinners on the original 8 . Not where most enthusiasts go first. High output Pontiac V8 Cylinder Heads. 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. In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. The SD-455 used round-port cylinder heads similar to those used on the 1971 and 1972 455 HO, with specific "LS-2" intake and cast-iron exhaust header manifolds. It is a known fact that a person's pupils dilate slightly when viewing something pleasant to the eyes. There was also the addition of dual exhaust, and for vehicles equipped with a manual transmission, a slightly more aggressive camshaft. Regarding Crower's upgrade suggestions for its . The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. Also bowing in 1967 was the new Firebird, which had the . 1966 Pontiac Catalina technical specifications and data. All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Engine Oil: 95 ft-lbs. ][citation needed] T, While the exact total number of Ram Air V engines produced is not positively known, only about 25 303cuin (5.0L) engines were produced and about a dozen 428s and 366s. By comparison, the factory 421 H.O. Method used to retain pins in pistons: . Coil: GM . Carb: (3) Rochester two-barrels PMD The 4-barrel version was available from 1978 to 1981 and the Turbo version was limited to the 1980 and 1981 model year, however, it was originally intended to be available for the 3rd generation Firebird before its cancellation by GM. 540306 featured 1.92/1.66-inch (49/42mm) valves and was carried over from the previous model year, production stopped in March 1962 and then casting No. The Ram Air IV replaced the Ram Air II in 1969. - P.Top - Correct Exterior/Interior. 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. Apparently at least one of these engines survives under the hood of an engineer's personal Pontiac. Unfortunately, that's what happened with the 1963 Pontiac Super Duty 421. 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. For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). Block casting # 9773157. 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. The 338-bhp four-barrel was the base engine. Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. An example of data being processed may be a unique identifier stored in a cookie. 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. 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 . 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. 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. 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. 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. The horsepower ratings of this era were often dubious, with engines rated higher or lower in output for advertising, political, or insurance purposes. This is it! pontiac engine decoder year code c/i hp tran carb car misc 1962 13b 421 3 m 2 x 4 full super duty 1962 13u 421 4 m 2 x 4 full super duty 1962 bu 421 4 m 2 x 4 full super duty . Regarding Crower's upgrade suggestions for its camshaft, Jim pretty much has it covered. VEHICLE TYPE . "1966 Pontiac 2+2" "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. Along with proper parts selection, accurate machining and assembly are also important Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. The 1966 Pontiac GTO was also the first car to replace the aluminum grille with plastic mesh-pattern inserts. Math, not gasoline, makes horsepower under the hood of a Pontiac. With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. Spiral clip The 1963 Catalina two-door sports sedan pictured here showcases the 421 H.O. The 455 HO moniker was again carried over, this time as a near-exact repeat of the 1971 offering, the only changes were the carburetors (they used a conventional 750cuft/min (21m3/min) unit this year), and the head castings (casting #7F6). With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. 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. Only one is known to survive today. Tri-power engine rated at 376 hp. The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 Some 400s were dealer installed. 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. Learn how Classified Ads works . Additionally, the 301 W72 never received the option to come equipped with a manual transmission like the standard 301 received in 1979, and disappointingly, production for all Pontiac V8's ended soon after as GM sought to "corporatize" engine production. Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. Here is another number to ponder: 370 hp. Splayed main caps, head bolts tie into main caps. aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. The first of the "big journal" Pontiac V8s, it had a bore and stroke of 4+332in 4in (104.0mm 101.6mm) and came with dual four-barrel carburetors. Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. This was based on results of over 1 million test miles, which was unheard of at the time. 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. The engines feature a cast-iron block and head and two valves per cylinder. It's well documented that an internal combustion engine is nothing more than an air pump. Casting No. 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. A total of 1,808 Ram Air IV production cars were built over its 2-year production. The consent submitted will only be used for data processing originating from this website. Rod bolts or studs/head bolts or studs: ARP cap screw supplied in Howard's rods / PMDOILING SYSTEM Vacuum advance: Not usedEXHAUST 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. 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. Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. Using an equation the author has provided in HPP many timesmost recently with The Mule engine seriesit was revealed that around 228.6-cfm flow though the intake port of the cylinder head is required to produce the desired 470 hp. in., again available only in the GTO and Firebird. For the truly obsessed, 16 Grand Prixs were built with Pontiac's 421 Super Duty engines, rated at a staggering 370 bhp. 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). From a performance perspective, the 2+2 is pretty impressive. 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. A mere five were built, all with a four-speed transmission. 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. [citation needed]. In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. 301 2-barrel (135hp, 101kW), (5th character of the, 301 4-barrel (150hp, 112kW), (5th character of the. 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. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). 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. Maximum flow at 28 inches of water Ram Air induction was optionally available with the 455 HO in the Firebird Formula (standard on Trans Am), and the 2-door LeMans (including GTO). This same camshaft was also used in Pontiac's 19691970 RA IV production cars. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Centerline: 110-deg 1963 - 389 SD Code 543797. For 1967, Pontiac retired the 389cuin (6.4L) and replaced it with the 400cuin (6,554cc), a 389 bored-out by +0.06in (1.5mm) to a bore and stroke of 4.12in 3+34in (104.6mm 95.3mm). 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. which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. The Ram Air IV heads had 1/8" taller intake ports, larger intake port volume with more airflow, yet shared the Ram Air II round exhaust ports. As a result, peak horsepower dropped from 310 to 290, though torque increased from 390 to 395lb. This new material had stronger alloys in the iron. 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. [22]. Lifters: Crower solid with EDM oil hole (0.024 inch) Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. said the "Pontiac 421 cu. 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. [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. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. During 19511952, Pontiac had 23 287cuin (4.7L) V8-equipped 1953 model production prototypes running tests on the GM proving grounds. Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . 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). 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. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. An HO version could be ordered in the GTO, as GM had lifted its restrictions on offering engines larger than 400cuin (6.6L) in mid-sized cars (resulting in the 454 (7.44) Chevrolet Chevelle, The 1966 Pontiac Ventura doesn't necessarily come up when speaking of 60's muscle cars, but the type of V-8's offered with the Ventura meant plenty of power. 1962 - 389 SD Code 544127. 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. When fitted with other high-airflow components, it produced a good balance of low-end torque and higher-RPM power. Here are features on more than 100, Muscle cars created their own culture. . gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS . Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. Oil pump: . Initial advance: 18-deg Beep, beep! The 428 was factory installed in large cars only. The shaker wore the decals "455 H.O." Styling for Status. Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. Size cfm: Total flow, 1,050 cfm The valve angle was reduced from 17 degrees to 14 degrees for better breathing. There are no manual transmission equipped Trans Ams that came factory with the standard L78 400 motor in 1977-79. Ultimately Pontiac produced only 295 1973 SD-455 Firebirds (252 Trans Am, 43 Formula). 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. 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." Melling PN M54D with 60 psi spring, made 70 psi at 6,000 rpm with 30W oil 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. Valves: Competition Products stainless steel, 1.92 /1.66-in A three-speed stick was standard; a four-speed and automatic cost extra. Engine displacement is a function of bore and stroke. Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. Rings: LPC (Liberty Performance Components) premium moly, standard tension Bolts or Parts: Lube or Sealer: Torque to: Main Caps. Preparation: File-fit for end gap if needed, wash The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. 1962 Pontiac Catalina, Royal Bobcat Super Duty 421. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. Pontiac . . 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. / 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . 1969 - 400 Ram Air III Code 62. . Pontiac offered this to the public as a streetable version of the 421 SD. intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. 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). It was rated at 475hp (354kW). Pontiac still offered the regular 455 (RPO L75) in its full sized cars, and after a negative public reaction for dropping the 455 engine, it was re-introduced mid-year as an available option for the 1975 Pontiac Trans Am. 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 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. The 301.6cuin (4.9L) 301 was offered from 1977 to 1981 and also installed in other GM cars during those years. By 1979, Pontiac was no longer allowed to produce the 400 engine as emissions further tightened. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Pontiac introduced the OHC 6 in two flavors for '66: a base engine with a one-barrel carburetor that developed 165 hp at 4700 rpm, and a sportier version with a 10.5:1 compression ratio, a high-lift cam, a split exhaust manifold, and GM's new four-barrel Quadrajet carburetor (below). More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. [11] By mid-1978, the W72 could no longer be ordered in conjunction with the MX1 3-speed Turbo-Hydramatic 350 automatic transmission, and could only be ordered with the 4-speed manual transmission. Optional was the obligatory four-speed manual or new-for-1965 Turbo-Hyramatic three-speed automatic.
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