pontiac 428 torque specs

Current products need to be checked. We also machine cast iron heads to accept the same style as aftermarket heads which accept the positive locking valve stem seals. 265, 301, 307*, 326, 350, 389, 400, 421, 428, 455. It idled slightly better with a gain of about 1.5 inches of vacuum in Park and Drive. However, all relevant changes that significantly affect cam operation will be included in our discussion. Id like to discuss basic camshaft operation, nomenclature, and application information for cams in Pontiac street and street/strip cars as well as the results of the cam changes on the LeMans wagon. It is also repeatedly recommended to re-torque the intake bolts to specs several times, cold and at operating temperature. / 11 mpg (U.S.) / 4.7 km/l, more data: RWD (rear- wheel drive), manual 3-speed gearbox. When we install a set of Aluminum Pontiac cylinder heads we use the following torque sequence pictured below. The quarter-mile performance with this longer-duration cam was comparable to that provided by the 041, but both the idle quality and derivability deteriorated. Power was directed through a Ford Toploader four-speed, close ratio transmission. improved .15 second and car gained 1.5 mph with no loss of idle quality or derivability. One point of note concerning the Boss 429s interior relates to its visibility group, which was rather comprehensive in scope. It was the kind of car your rich uncle (by marriage, twice removed) drove, to keep his bank's depositors from getting edgy about the way he handled. Clockwise (*307 rotates Clockwise) These graphics courtesy of . Rhoads lifters cause a ticking noise similar to solid lifters. 428 Engine Specifications | Classic Cars 428 CJ/R & SCJ/R "Q" 4V 1968-1970 (R=Ram Air) 428 "Q" (1966-68) 428 "P" (1966-70) (P=Police Interceptor engine) 90 degree, Overhead Valves (OHV) 8 cylinder 90 degree, Overhead Valves (OHV) Displacement 428 cu.inches (CID) 428 cu.inches (CID) Maximum torque 440 lbs./ft. Engine displacement has a major effect on cam operation. Download our convertor recommendation sheet, then fill it out and fax or email the sheet to us. Again, the two cams provided similar performance, but the car gained about .I second and I mph in the quarter-mile as a result of the new engine. In an attempt to move the power back up in the rpm range, the cam was retarded 3 (intake CL at 107). The article may be reprinted, but please give credit to the Pontiac Enthusiast. In our performance tests, the broad power range of this cam is obvious. Your journey awaits. Since that time, we have learned more about Pontiac cams, and a comprehensive article on the subject was prepared for the Fall, 94 issue of Pontiac Enthusiast magazine. Buy a Victor-Reinz part number 95158SG for MR or Victor Nitro Seal 95159SG. Detailed Search Interface on the Home Page, Photo of the moment:2010 Porsche Cayenne S (Photo: Dr. Ing. All years same class and body style Pontiac cars: Cars Catalogue Homepage - Automobile-Catalog, View all Pontiac Grand Prix 2gen versions & production years. A crankshaft transfers the energy created during combustion into a rotating force that's channeled through a transmission and rear axle, and finally to the tires for vehicle motivation. At the track, the car was slower to 60 feet, but it ran the same E.T. The scoop really sets it apart from the appearance of all the traditional '64s. on Pontiac Cylinder Head Bolt Torque Sequence, Check out Bill Mellotts 1965 Pro Mod GTO it is FOR SALE. The engine delivers its power through to the wheels via a 3 speed automatic transmission. 1967 LeMans with a stock-block 455 with 2-bolt mains, D-port heads, and alcohol. I got mine in 1981.It needed a bit of maintenance. If Darth Vader had a car, this Pontiac would be his choice, I guess. Engine horsepower and torque curve for Pontiac Bonneville Hardtop Coupe 428 V-8 4-bbl (man. @ Super8: This was a rare version of the Pontiac GTO, I never heard of the Bobcat Special. You do not acquire A typical cast-iron Pontiac D-port measures 190 to 210 cfm of peak intake airflow at 28 inches of pressure. The Boss 429 carried an output rating of 375 HP, and 450 lb-ft of torque. Freeway cruising at 4000 RPM is anything but pleasant and promises short life for hard working engine components. What about lift? site (including ProfessCars and automobile-catalog.com) are protected under applicable copyrights, trademarks and other Jan 31, 2018 The first Pontiac V8 lasted only one year. The 041 cam was never factory-installed in the B-body cars. The counter shaft bores were oblonged from the engines massive torque. The Boss 429 carried a seriously aggressive appearance, which few could overlook. Now select an engine model (if applicable) -- Pontiac Engine Models -- All Pontiac Kits 151 301 326 350 3800 389 4-cylinder 400 421 428 455 Brodix Heads Edelbrock Heads Iron Duke L67 Pro Stock Dart Heads Pro Stock Heads Ram Air Runner Heads Super Duty Generic V8. This combination idles in Drive smoothly at 570 rpm, with more than 14 inches of vacuum when warm, so the car is very easy to drive on the street. Heartland was founded over 17 years ago by a group of veteran RVers. If identical specifications were obtained from each manufacturer, they would all perform similarly That is not to say that one manufacturers popular cam wont perform better than a competitors, but if it does, the improvement would be attributable to different technical specifications more suitable to the application. Flash rpm will normally be higher than the stall of a given converter, because the engine will continue to accelerate as it yanks the converter to the point at which the car has to move. Cam #1, with its advanced timing and relatively short duration, moved the power range to a lower rpm and cut off some of the upper-rpm power, thus losing mph. We will call you back with our recommendation. ft/65.3 kgm) at 3200 rpm. Not difficult to drive-up to a point. Pontiac Grand Prix Hardtop Coupe 428HO V-8 (man. Included was a parking brake warning light, luggage compartment light, ashtray light, glove box light, and a lighted ignition switch. The same ported 7K3 heads, Performer RPM intake, and reworked 13/4 x 3 headers were reinstalled. Adjust the lash of the intake valve at this time. 3) , model year 1968, version for North America U.S. (up to September): 1968 Pontiac Grand Prix Hardtop Coupe 428 V-8 4-bbl (man. An LSA of 108 is considered tight; 115.5 is considered wide. Privacy Policy, Cookies Policy and Terms and Conditions and Disclaimer. Pontiac Engineering developed excellent cams for the various applications they were faced with in the glory days of the first musclecar era. Wider LSAs allow the engine to idle better, produce more manifold vacuum at both idle and cruise, give better fuel economy, and produce a wider power band. This netted a 0.1-second loss of performance and little change in mph. / 8.6 mpg (U.S.) / 3.7 km/l, more data. ft/64.2 kgm) at 3400 rpm. Click to complete our Trade In Evaluation. If a cam design includes strong low-rpm power, the cam will not work as well at higher rpms. 4) Detailed Performance Review, 1968 Pontiac Grand Prix Hardtop Coupe 428 V-8 4-bbl 4-speed (man. . In our analysis,we consider it the prime factor for street performance . The chart below clearly illustrates that cam design is a compromise. And for more details on what we sell or how we build our engines check out our website www.butlerperformance.com It musters power and torque figures of 350 bhp (355 PS/261 kW) at 5000 rpm and 603 Nm (445 lbft/61.5 kgm) at 3000 rpm respectively. Firing Order. RWD (rear- wheel drive), automatic 3-speed gearbox. Pontiac Grand Prix Hardtop Coupe 428 V-8 4-bbl (man. As the lobe positions were identical to the 041, any performance changes would be due to the increased duration. It runs in the 12.35 to 12.60-second range at 107 to 110 mph (7.90/88 mph in the eighth-mile), with 60 foot times in the 1.80-second range. Setup team did very well. All Boss 429s were shipped to Kar Kraft in Brighton, Michigan, where they were further prepared prior to distribution. Continue turning engine while paying attention to the intake valve. 428 FE Rebuild. 3) version for North America U.S. (up to September) specs. This spoiler was designed to reduce aerodynamic drag acting upon the car at a high rate of speed. The overall result is the ability to use a fairly radical camshaft to maximize mid-range and top end power while developing strong lowed torque. Lift at Cam lobe: .294/.310-inch intake/exhaust with a slight gain of 0.2 mph. Rear tire breakaway could be provoked by a slight jab at the accelerator, sending the car into a minor skid that usually used up more than one lane of space.". Some of the most common questions regard cooling the Pontiac engines and water pumps. . No performance gain, and even worse low-speed performance. That is why Pontiac (and most other car makers) almost always installed a shorter-duration cam in automatic-trans performance cars as compared with their manual-trans counterparts. fuel consumption and mileage: average estimated by a-c: 23.5 l/100km / 12 mpg (imp.) Engine Year Info Spark Plug Plug Gap Point Gap When we are tightening the heads up we typically do so using 30 wt oil for lubrication. It's time to get on board, hit the road, and enjoy life's great adventures. Pontiac Grand Prix Hardtop Coupe 428 V-8 4-bbl Hydra-Matic (aut. Strong low-end performance will degrade the upper rpm range. IN. No, I didnt find a magic cam for my Pontiac, but this limited testing indicated that the Pontiac 041 with Rhoads variable lifters and 1.65:1 rockers is very hard to beat in an automatic car with a 455. For this reason, the manufacturers of the custom cams will not be listed. However, since tighter lobe separation increases overlap, idle quality will be degraded. Torque - twisting force. Cylinder Numbering: Distributor Rotation: Rotor Under Cap Spins: Counter. Car was all but impossible to drive on the street due to the rough idle and loss of low-end power. Your email address will not be published. 4) Market Competition, 1968 Pontiac Grand Prix Hardtop Coupe 428 V-8 4-bbl Hydra-Matic (aut. Too much throttle at the wrong time will spin the car, or send it rocketing off the road and into the farmer's field. A number of regular advertisers in Pontiac Enthusiast service and race Pontiacs exclusively, and they should be able to help you. We also torque most of our aluminum heads up to 95 total foot lbs. The planned rpm ranges to be used must be considered, and the torque capability and torque range of the engine in question must also be factored in, as should the type of transmission torque converter used. More strictly. Your email address will not be published. Car and Driver wrote that the 428 CI powered car was "a fine, exciting car for either touring or tooting around in traffic. While the Boss 429 is immensely popular among collectors today, this was far from the case in 1969. 3) Horsepower/Torque Curve, 1968 Pontiac Grand Prix Hardtop Coupe 400 V-8 4-bbl Hydra-Matic (aut. Intake centerlines indicate degrees of factory cam advance, usually 1 to 3 degrees. Required fields are marked *. The relatively tight converter and 3.55:1 gear ratio allows extended driving at 65 mph with no overheating and yielding reasonable gas mileage. Cams are vitally important to an engines performance, and a cam change must be carefully evaluated in order to obtain the expected benefits. Let us help guide you in making the best decision for your Pontiac Valve Cover application. It was obvious that this was too much cam for the wagon as it is presently set up, but we wanted to feel first-hand what this type of cam does to real street performance. Most lean toward driving it aggressively, varying rpm as much as you can for the first 100 miles for sure. 3) , model year 1968, version for North America U.S. special version (up to September): 1968 Pontiac Grand Prix Hardtop Coupe 428HO V-8 Hydra-Matic (aut. Technically, the 1.65 rockers do not change the duration of the cam lobes. Amazingly, achieved by using the same block outer dimensions and configuration. Two trips were made to the strip, and tests were made with and without mufflers, but the quarter-mile performance was identical to the 041. This is apparent by looking at the horsepower ratings for the last three cams listed. Shame Pontiac is gone, I'd love to see a successor to this car On the other hand, according to Car Life, the Ram Air powered car "likes to run between 3000 and 6000 RPM. Turbocharging Performance Handbook: Turbo: Real-World High-Performance Turbocharger Systems . The 428 CI engine was disassembled and blueprinted to produce more than the advertised factory 390 horsepower and easily spinning to 5700 RPM's. Under the Copyright, Designs and Patents Act 1988, the content, organization, graphics, design, compilation, magnetic function e984c928a04df0be4fb7() { return WSM.Util.rot13('jro!ohgyrecresbeznapr.pbz').replace('! The 041 cam is suitable for both the 400- and 455-equipped cars with 4speed transmissions, with or without the Rhoads lifters. The rods were checked and resized with new Pontiac rod bolts installed. If it is designed for great high-rpm power, a very large hole will be left in the low-rpm power range. In the third step, we go to 60 ft lbs. 3) Horsepower/Torque Curve. Perhaps most noticeable was the Boss 429s fully functional hood scoop, which was far more pronounced than that found on any other Mustang of the era. Some product and company names mentioned on this site may be trademarks of their respective owners. Begin by working a single cylinder at a time. As a last attempt to find some performance gain, 1.5 rockers were installed on the exhaust only (the 1.65s were left on the intake side) to ensure that the exhaust system was not over-scavenging the intake. Therefore Pontiac used wide LSAs on all factory cams. We balance power and reliability and our combinations are tried and true and can be found in some of the world's top Pontiac's. When the exhaust valve begins to open, STOP! 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. The Boss 429s rear fenders took on a flared appearance and featured integrated air scoops that were mounted to their leading edge. The compression ratio now calculates to 10.1:1. The idle was extremely rough, with vacuum about 9 inches at 700 rpm in Park and falling to 7 inches at 600 rpm in Drive. While the Boss 429 would only remain in production for two years, its legacy remains. This article details how to install an EFI in-tank pump in a stock or stock reproduction tank. 3) , model year 1968, version for North America U.S. special version (up to September): 1968 Pontiac Grand Prix Hardtop Coupe 428HO V-8 (man. It was beginning to appear that Pontiac Engineering might actually have known what they were doing when the 041 was designed. 28 April 2020 Share Leave comment Karissa Hosek/Auctions America It's the end of April, or, as we like to call it at Hagerty, Engine Week. The period of time in crankshaft decrees that both the intake and exhaust valves are open. Plus tax, title and license. Any price listed excludes sales tax, registration tags, and delivery fees. @ Super8: That's true, when the Pontiac GTO came back in 2004, I noticed it had a strong resemblance to a Holden Monaro, and Vauxhalls and Holdens aren't even sold in America as Vauxhalls and Holdens, the Chevrolet Caprice that some police use now is actually a rebadged Holden. 3) Standard and Alternative Wheel and Tire Sizes, 1968 Pontiac Grand Prix Hardtop Coupe 400 V-8 4-bbl (man. Part-throttle driving at 2000 RPM around town was difficult and unpleasant. proprietary (including but not limited to intellectual property) rights. Even though the cam is developing more horsepower in the upper ranges, the overall quarter-mile performance is not improved. Performance, as used in this article, includes idle quality in the 550 to 700 rpm range, throttle feel, and driving ease, in addition to actual quarter-mile elapsed times and speeds. For the third cam test, a racing grind was tried. 428: 360, 376 hp: 2 . The 60-foot times were slightly quicker. 3) version for North America U.S. (up to September) specs. It had run 12.40s on nitrous oxide prior to its installation in the wagon. Do not generically apply Chevy practices to an FE rebuild. Cam #2 was specified with the lobes at identical positions to the 041, with the intake at 112 and the exhaust at 115. by Lou Vecchioni . Torque comes on strong around 3,500 rpm and continues through 5,500 rpm. Violations of copyright will be prosecuted under the fullest extent of the law. The 041 was reinstalled, and the normal performance returned. 4) Standard and Alternative Wheel and Tire Sizes, 1968 Pontiac Grand Prix Hardtop Coupe 428 V-8 4-bbl 4-speed (man. 3) version for North America U.S. special version (up to September) specs. The electric motor rating is 50 hp at the base speed and the system peak torque at the coupling is estimated to be 150,000 lb-in . However, Ford never intended this of the Boss 429 rather envisioning the car as a testbed for their newly designed NASCAR engine. Minor changes in lobe location and/or cam timing can compensate for unusual aspects of your engine/car combinations (such as excess compression or some need to narrow the power range of the engine), but radical departures in duration and/or cam timing from the Pontiac designs will be a compromise, and performance gained in one rpm area may be lost in another. fuel consumption and mileage: average estimated by a-c: 25.9 l/100km / 10.9 mpg (imp.) As the converter action has a tremendous effect on the load seen by the engine, cam operation is significantly affected by the converter used, and the effect on the wagon will be discussed later. During the horsepower wars of the first muscle car era, advertised horsepower was not always accurate, due to competition against other manufacturers and also to various racing associations rules. This duration difference must be considered when attempting to duplicate the performance of a cam using 1.65 rockers with a different cam and 1.5 rockers. Pontiac Head Torque Pattern Diagram BACK Tech Articles. It should also be noted that during the horsepower wars of the first muscle car era, advertised horsepower was not always accurate, due both to competition from other manufacturers and from various racing association rules. This article is not intended to be a test of cams. Pontiac V8 Engine Tune Up and Torque Specifications. The 041 cam has .407 lift on both intake and exhaust (.313 lobe height). Most aftermarket aluminum castings flow anywhere between 260 and 330 cfm. All 429s were then fitted with heavy-duty shocks, robust front and rear sway bars, and high-performance power front disc brakes. In addition to the rough idle and low vacuum, it would not run smoothly at constant speeds until about 2,000 rpm. We all know that 1.65:1 rocker arms provide 10 percent more lift than 1.5:1 arms, but how do they affect the cam durations. 3) Detailed Performance Review, 1968 Pontiac Grand Prix Hardtop Coupe 428 V-8 4-bbl Hydra-Matic (aut. As mentioned previously, all of the custom cams provided good performance at the strip, but in direct comparison, the 041 provided as good or better quarter-mile performance along with superior idle characteristics (with the Rhoads lifters). vehicle. Full specs Key facts 1969 Pontiac Grand Prix 428 specifications Additionally, the carburetor must be optimized for such applications. At the strip, it ran the same E.T. 428: 1967: W/O AIR: 44S: 0.035: 0.016 . 3) Horsepower/Torque Curve, 1968 Pontiac Grand Prix Hardtop Coupe 428HO V-8 Hydra-Matic (aut. ownership rights to any content, document or other materials viewed through the Power is supplied to the wheels through a 4 speed manual gearbox. The weight/viscosity of the engine oil used will have a significant effect on leakdown lifters. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. 3) Detailed Performance Review, 1968 Pontiac Grand Prix Hardtop Coupe 428 V-8 4-bbl (man. The valve overlap determines idle quality; more overlap reduces idle quality. However, this long-duration cam was totally unsuited for real-world street driving. Typical process: set up the valve machine once for one (low) seat and than do all the seat pockets to the same depth, using the same seat inserts, they all come out level. However, the 1.65 rockers cause the valve to reach the .075-inch (.05-inch x 1.5 rocker arm ratio) lift point 1.5 to 2 cam degrees earlier than with the 1.5 rockers. A 428 was cast on the side of the block and in the lifter valley was a 28. We also torque most of our aluminum heads up to 95 total foot lbs. Lift at Valve: .517/.546-inch intake/exhaust, with 1.76 rocker arms Reproduction of part or all of the contents of this web-site in any form is prohibited and may not be recopied and shared with a third party. The other is original Bobcat and Ram Air V. This one is special.

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