It included a new camshaft with duration increased from 288/302 (No. Trend suggests a procedure that requires finding a pair of washers with 0.140-inch inside diameters. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. 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 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. A total of 1,808 Ram Air IV production cars were built over its 2-year production. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. For a better experience, please enable JavaScript in your browser before proceeding. So a 7.800 base length pushrod turned five revolutions from its starting point would equal 0.250-inch. 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). The external dimensions of all their V8s, from 326455cuin (5.37.5L) were the same. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. Often called the "Ram Air III", this engine was officially called the "400 Ram Air" for 1969 and then simply "Ram Air" for the 1970 model year. Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars. Nevertheless, there appears in the October 72 issue of MOTOR TREND, a road test of a 1973 SD-455 Grand Am. From 1977 to 1981 there were 4 distinct 301 versions: For 1981 model year vehicles, the engine codes are the 8th digit of the VIN. This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. i guess if there is no oil in the lifter the cup has bottomed out so the only thing to move is the valve right? An innovative design feature was mounting the rocker arms on ball pivots on studs set into the cylinder head, rather than using a separate rocker shaft. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. One of the key upgrades were the 6x4 heads. 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). 1999-2022 RockAuto, LLC - Madison, Wisconsin USA. If you were to watch a rocker arm from the side as it traversed through a complete lift cycle, the tip of the rocker arm does not travel straight up and down, but instead scribes an arc that pushes and pulls the rocker tip across the tip of the valve stem. Manufactured by Elgin Industries in the USA. "Armasteel" referred to its "locking ball" cast-iron, as opposed to the "flaking" type found in other engines. The short-deck block and different intake ports also required the design of a new intake manifold. Still, it was the strongest American engine offered that year. Effectively, Pontiac's V8s were all small blocks, sharing the same connecting rod length 6.625 in (168.3mm) (except for the later short deck 301 and 265 produced in the late 1970s and early 1980s before Pontiac adopted universal GM engines). The guy says that is how it is done with most hi-perf engines. No, it doesn't have to spin fast. 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. 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. Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. Pricing and promotions may change at any time without prior notice. All 196869 #9792506 Ram Air 400 blocks have 4-bolt caps. 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, although some literature has indicated that the 301 Turbo may have found its way into the Chevrolet Camaro Z28. Is this common when going from standard stamped steel to billet rollers. 1967 was the last year for closed-chambered heads. WARNING: This product can expose you to chemicals including but not limited to lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride and/or 4, 4'-methylenebis (2-chloroaniline) which are known to the state of California to cause cancer or birth defects or other reproductive harm. [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. The 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. The 301 Turbo was unique since it had a beefier block than the 197779 versions (which carried on in the non-turbo versions in 1980 and 1981), a very mild camshaft with 0.35in (8.9mm) lift and 250 degrees gross duration, a 60psi (4.1bar) oil pump to ensure adequate oil to the oil-cooled Garrett TBO-305 Turbocharger, a rolled fillet crankshaft, a fully baffled oil pan, and a specific 800cuft/min (23m3/min) Quadrajet carburetor. This test would tend to lend credence to the CAR AND DRIVER and HOT ROD tests of 1973 Super Duty cars with 3.42 gears, no air, and 160lb (73kg) less weight as being representative of production specimens capable of mid to high 13-second passes at 104mph (167km/h). Suitable for up to 500 Lbs open pressure. This same camshaft was also used in Pontiac's 19691970 RA IV production cars. After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400cuin (6.6L). Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. 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. [2] This was the engine installed in Pontiac's "executive" line of large cars[3] and its largest station wagon. He replaced the regular valve seals with positive valve seals and removed the caps on the springs. Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. but, i have a question when i tightened up the pushrod and added a half turn, the valve went down instead of the lifter is this normal? The Ram Air II also incorporated the first computer-designed camshaft. [19] The cylinder head design is similar to the Ford FE tunnel-port head used in the GT40 and Can-Am series racing. If the pushrod is too short, the mark will be toward the intake (inboard) side of the valve tip. 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. By 1965 and 1966 the same combinations would be rated at 338hp (252kW) for the 4bbl and the two Tri-Power versions would be rated at 356hp (265kW) and the H-O version at 376hp (280kW). 068) to 301/313 (No. A quick way to get close to the proper pushrod length is to first paint the top of the valve tip. The heads were a new design featuring siamesed intake ports. I use the copper coat on both sides of every head gasket job I do. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. 1964-1967 Pontiac 326 V8 and 1964-1966 389 V8 High Strength Chrome-Moly Pushrod. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model year. 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). The 301 had a bore and stroke of 4in 3in (101.6mm 76.2mm). Both used a single two-barrel carburetor. Generally, these are restricted to an adjustment range less than 0.025-inch, so the pushrod length must be very close to ideal. 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. Neither casting was equipped with an exhaust crossover. This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. When you see oil coming out all of the pushrods, you're golden. Pushrods that are either too long or too short only increase this distance. - eBay Money Back Guarantee - opens in a new window or tab, - for PayPal Credit, opens in a new window or tab, Learn more about earning points with eBay Mastercard, - eBay Return policy - opens in a new tab or window, - eBay Money Back Guarantee - opens in a new tab or window. Come join the discussion about performance, modifications, troubleshooting, maintenance, history, and more! Maximum RPM (high-RPM engine): over 8000 rpm, Engine weight: estimated 550lb (249kg) complete, Power: estimated 640hp (477kW) at 7500rpm, This page was last edited on 4 July 2022, at 06:04. Any commments would be greatly appreciated. None of Pontiac's Ram Air engines actually enjoyed any true ram air effect. These fine pushrods feature 210 degree radius ends which allows for higher lifts without tip binding, this feature is only available on high end pushrods. The engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. If you look at the accompanying diagram of how the rocker tip moves across the face of the valve tip, this description will become clear. More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. Measuring a pushrod that combines both a ball tip and a cup requires the use of a machinist's ball. The 2-barrel version was last offered in 1979. The W72 offered many improvements over the standard L78 400 Pontiac. Standard in the Firebird Trans Am, it was still a rare engine. Shown below are parts other customers have bought with. If you are assembling a new performance engine equipped with non-standard parts like 0.100-inch longer intake valves or lash caps, these components directly affect the pushrod length. 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). Enter your email address below and click the 'Notify' buton to receive notification when this item is available again: Enter a note to be sent with your notification (optional): Not Valid With Any Other Sales OfferThere is no minimum purchase amount required for free shipping on this item. The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. Conversely, a pushrod that is too long positions the rocker tip too far outboard (exhaust side), forcing the roller tip potentially to travel off the edge of the valve tip. 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]. Engine displacement is a function of bore and stroke. Two-barrel carburetor, 8.5:1 compression, 227hp (169kW) @ 4600rpm, 333lbft (451Nm) @ 2300rpm, Four-barrel carburetor, 10:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Two-barrel carburetor, 10.0:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Four-barrel carburetor, 10.25:1 compression, 270hp (201kW) @ 4800rpm, 359lbft (487Nm) @ 2900rpm. Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). Different manufacturers use various pushrod seat height lifters that affect pushrod length. Pontiac differed from other GM Divisions and most other manufacturers in producing only a single small block V8, rather than adding a larger big block to its line-up. [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. Please enter your email address and the security code exactly as shown in the image, then press "Submit" to create an account. 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. I found that summit has 8.55 inch pushrods that are 5/16 diameter and have the correct oiling passage and ball ends. In basic 2-barrel form it produced 290 horsepower and 428ft. pounds of torque in 1968. 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. As a result, it was remarkably free of teething problems. In 1967 the 421 was enlarged to 426.61cuin (7.0L) by increasing its bore to 4.12in (104.6mm). Unlike previous enlargements of Pontiac V8s, it did not replace the 389. For example, the 10.800-inch version pushrod tool will extend out to 11.800 inches. But the performance world has evolved- power numbers are escalating, engine speed continues to climb, and spring rates are growing- all of which adds to valvetrain stress. This will generate a close approximation of the ideal pushrod length for street engines. It's actually pretty easy, and we'll show you how. 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]. Offered from 1967 to 1969, it produced 360 and 376hp (268 and 280kW) in 1967, 375 and 390hp (280 and 291kW) in 1968 and 360,370 and 390hp (268,276 and 291kW) in 1969. Price will be updated as you change quantities on the product page. 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. The cometic mls gaskets have been heat cycled 6-8 times now, is this something i should replace? Splayed main caps, head bolts tie into main caps. 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]. 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. Offer is not valid on previous purchases and cannot be combined with any other sale or promotion offers unless otherwise stated. Standard only for the Pontiac Bonneville was Pontiac's first-ever fuel injection system. Though production cars only got the two hood air inlets the name was retained. The reason for the 8.55 pushrod length is the the base circle of the old cam in this 1966 389 engine was 1.22 inches while the base circle of the new Crane cam is 1.30 inches. These are necessary to accurately place the measurement point at the 0.140-inch radius of the pushrod tip. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. 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. Below are the available bulk discount rates for each individual item when you purchase a certain amount, Heat Treated, .065" Wall, Chrome Moly Pushrods, Elgin 800 Series. These heads can be distinguished from 6x8 heads through a small stamped "4" on the top of the front boss. So large are the intake ports that the pushrods run through the center of each port via pressed-in tubes, in addition to streamlined airfoils over the tubes themselves to improve port shape, and increase flow velocity. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. In Stock - Item usually ships within 24 to 48 hours, WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. This offer is not transferable and will not be extended. 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). Click the button below to add the PUSHRODS, PONTIAC 326, 389, 421, 8.693" X 5/16 HEAT TREATED CHROME MOLY to your wish list. This is a limited time offer. The Ram Air IV used the Ram Air II's camshaft but lift in the Ram Air IV was increased to 0.52in (13mm) thanks to the use of 1.65 ratio rocker arms (vs 1.50). aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. Later heads had actual pushrod guide plates and also used the hardened pushrods. The 1972 455 HO was available in the Firebird (optional in Formula; standard in Trans Am) and 2-door LeMans (including those with the GTO option) and LeMans Sport convertible. 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. Place the ball in the cup and measure the overall length including the ball. [22], 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, "1969 Pontiac Grand Prix 428 specifications | technical data | performance | fuel economy | emissions | dimensions | horsepower | torque | weight", "Muscle Car Horsepower How Exaggerated Was It? 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). The 1972 455 HO was rated at 300hp (224kW) @ 4,000rpm and 415lbft (563Nm) @ 3,200rpm. The inlets were all well within the boundary layer that exists close to the surface, so all of these systems would more accurately be described as "outside air induction" systems, benefiting from the intake of cooler, and thus denser, outside air versus the comparatively hotter and less dense air under the car's hood. 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]. It had a four-barrel carburetor, dual exhaust, and higher compression, and was good for 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 - 1966 and the final year, 1967. 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 machinist's ball should measure 0.3125-inch in diameter. Also, the new cam was about .010 longer, end to end, than the old cam {nothing to do with pushrod length--just general info}. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. For those engine builders who live to be ultra-precise, custom pushrods lengths can also be ordered. The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. The 428 was increased to 456.12cuin (7,474cc) in 1970. 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. The four-barrel 400 was a popular performance option for many of Pontiac's cars. Other variables that affect pushrod length would be changing from a flat tappet to mechanical or hydraulic roller lifters. Offer is only available at YEARONE.com, phone orders are not eligible. The valve size increased as well, to 2.11in (53.6mm) intake and 1.77in (45.0mm) exhaust valves on high-performance heads. Seller assumes all responsibility for this listing. The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. Please create a password for your account. Get superior 210 radius end pushrods for one low price! Assuming we are dealing a 5/16-inch cup on one end, the technique is called the "overall length measurement". Using a mild Crane cam with flat tappet rockers. The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455". [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. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. As stated above i should have some thread left on the rocker arm studs when tightening them down no? Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981.