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". Royal Pontiac's engine swap wasn't a new trick for Pontiac. Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. 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]. Rod bolts or studs/head bolts or studs: ARP cap screw supplied in Howard's rods / PMDOILING SYSTEM 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. ft. After the SD-455 was certified with the new cam, it was production-ready but was then further delayed by the EPA mandating Pontiac recertify all of its engines when the EPA discovered that part-throttle emissions exceeded the limits. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. The Catalina was the base intermediate-sized Pontiac resting on a 121-inch wheelbase that it shared with the Safari and the Grand Prix. Rocker arms: Crower roller, 1.6:1 Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 It was rated at 475hp (354kW). 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. The head design was incorporated from the earlier 1970's 350 Pontiac heads, and could satisfy emissions in all states except for high-altitude emissions states and California. 1962 421 super duty motor Price $30000.00. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. 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. The external dimensions of all their V8s, from 326455cuin (5.37.5L) were the same. Pontiac V8 Engine Tune Up Specifications. [citation needed]. 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]. Splayed main caps, head bolts tie into main caps. 5 January 2007. However, compression ratios were cut dramatically, marking the beginning of the end of the muscle car era. Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. Setting initial timing at idle with the vacuum advance disconnected will usually fall around 12 to 16 degrees, but that's not really important. Intake: 218 cfm at 0.500-in . By 1949 work on a 287cuin (4.7L) OHV V8 had begun, but moved along slowly. Neither casting was equipped with an exhaust crossover. Along with proper parts selection, accurate machining and assembly are also important While all this sounds great, remember the engine will have to retain the small 1.92-inch intake valve because chamber space is too tight for larger ones. The 338-bhp four-barrel was the base engine. 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. 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. A higher-output version was offered, called the 326 HO (High Output). A mechanical system built by Rochester, it was similar in principle, but not identical, to the contemporary Chevrolet "fuelie". Open pressure: 282 pounds at 1.100-in 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 Pontiac 389 engine was produced from 1959 to 1966, and has a 4.06" bore and 3.75" stroke. Perhaps the most unusual variation of the Pontiac V8 was the 1961-63 Trophy 4, which was a 45-degree inclined 194.43cuin (3.2L) inline-4 created from the right bank of the 389 for the debut of the Tempest. The 1971 455 HO was available in the Firebird (optional in Formula; standard in Trans Am), the GTO (standard with "The Judge" package), and the 2-door LeMans, LeMans T-37 (including GT-37), and LeMans Sport. 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. After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400cuin (6.6L). Cam choice is always extremely important, and Jim decided to go with an aggressive Crower mechanical flat-tappet stick with 247/252-degrees duration at 0.050 and 0.515/0.525 lift (0.495/0.505 with 0.020 lash) with 1.6:1 rockers. Shipping to: 98837. 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. This simply meant that Pontiac installed both the SD-389 and SD-421 into vehicles on its assembly line. Tri-power engine rated at 376 hp. The consent submitted will only be used for data processing originating from this website. 068) to 301/313 (No. The Pontiac 2+2 was promoted as the "big brother" to the iconic Pontiac GTO. Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). Initially marketed as a 287cuin (4.7L), it went on to be manufactured in displacements between 265cuin (4.3L) and 455cuin (7.5L) in carburated, fuel injected, and turbocharged versions. Size cfm: Total flow, 1,050 cfm 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. It also sports the four-speed manual, limited . All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Standard only for the Pontiac Bonneville was Pontiac's first-ever fuel injection system. Tri Power engine however was optional. Wearing a revised GM B-body semi-fastback shape, the 2+2 option delivered a 421-cu.in. Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION . Jim Taylor, well-known Pontiac engine builder, had that question on his bucket list for years. 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). Not where most enthusiasts go first. The 1966 Pontiac GTO was also the first car to replace the aluminum grille with plastic mesh-pattern inserts. This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. Muscle Cars. Lobe separation angle: 112-deg Rings: LPC (Liberty Performance Components) premium moly, standard tension Preparation: File-fit for end gap if needed, wash This was to ensure there was enough fuel to cool the cast offset dished pistons. It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. I don't know if it can be done, but I'm going to try." Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. 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 . 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. It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". Here are features on more than 100, Muscle cars created their own culture. The heads were a new design featuring siamesed intake ports. Upon reflection, many did not consider that it was the only large displacement engine still on offer for any performance car on the market, and reconsidered Pontiac's position between the rising CAFE emissions restrictions.[14]. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. moniker from the shaker due to the disappointing public approval as the motor was not deemed to be "High Output". 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. [19] The cylinder head design is similar to the Ford FE tunnel-port head used in the GT40 and Can-Am series racing. Keepers: Comp Cams race locks Only about 400 were produced before the fuel injection system was quietly dropped. There was also the addition of dual exhaust, and for vehicles equipped with a manual transmission, a slightly more aggressive camshaft. Preparation: Magnaflux, check for equal stroke and index, grind, polish 0.010-in 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). 1969 - 400 Ram Air III Code 62. Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). 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. Initial advance: 18-deg 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. Original plans called for a forged crankshaft, although actual production SD455s received nodular-iron crankshafts with minor enhancements. The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. All 1977-1978 Trans Ams ordered with the 4-speed Borg Warner Super T-10 manual transmission received the W72 T/A 6.6 engine. The basic package included the heavy-duty suspension, with even stiffer springs and shocks available. For 1965, however, the 2+2 became a bonafide muscle car. Year. 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. The results showed Pontiac that an L-head simply couldn't compete with an overhead valve engine. Brand: Crower PN 60311, solid [2] This was the engine installed in the Pontiac Executive line of large cars[3] and its largest station wagon, the Pontiac Safari. Wires: NAPA Belden 7 mm [4] It was replaced by the 455 for the 1970 model year. 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. It was rated at 310hp (231kW) @ 4800rpm and 400lbft (542Nm) @ 3,000rpm on 10.5:1 compression. The four-barrel 400 was a popular performance option for many of Pontiac's cars. For those who may not be familiar with the equation, here it is again: Pontiac offered this to the public as a streetable version of the 421 SD. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. 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. Like the 421, the 428 used a large-journal crankshaft, but externally it was the same size as all Pontiac V-8s of that era (the later 301 used a shorter deck height). Year: CU IN: Casting # 1967: 326. 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. These muscle car profiles include photos and specifications for each model: For related car information, go to these articles: Please copy/paste the following text to properly cite this HowStuffWorks.com article: the Auto Editors of Consumer Guide A limited-slip differential and gearing up to 4:11.1 were optional. The 326 subsequently became the optional V8 engine for Tempests, and later the Pontiac Firebird, through 1967 and maintained the 17 degree cylinder head valve angle for its entire production run. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". ENGINE. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. 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. 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 four-barrel version with 10.5:1 compression upped horsepower to a healthy 285. . Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. 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. Retainers: Crower steel The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. 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? 1966 Pontiac Catalina . Length: 8.750-inCAM 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. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. 287. An example of data being processed may be a unique identifier stored in a cookie. Along with being cheaper to build, this allowed more consistent valve action with less weight than a conventional shaft.
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