This website is used for info on 70-81 Trans Am's and Pontiacs. Making 547 hp and 635 lb-ft of torque from a stroked Pontiac 400 - Hemmings Keep your compression ratio at about 9.5:1. In the interest of providing performance-minded Firebird buyers with an up-level 400 boasting of additional output, Pontiac's engineers created the T/A 6.6 for 1977. Author: OnAllCylinders Staff. Pontiac 400 V8 Engine - Engine Facts To celebrate the workhorse Pontiac V-8 (sorry Olds 403, today's not your day) we'll highlight some of our favorite applications of the staple muscle car . Heres Everything You Need to Know, Size the big and little ends, install new rod bolts, balanced, KB Hypereutectic, 0.030-455 flat-top with valve reliefs, Edelbrock aluminum, 60579, closed chamber. Comparing The Pontiac 400 And The Chevy 400: A Look At Their 1967-1970 High Output with 4-Barrel Carb Max Brake Horsepower: 335@ 5000rpm Max Torque: 430 @ 3400 rpm Stroke: 3.75 Bore: 4.1212 Compression: 10.5 Firing Order: 18436572 Middleton told him about his '61's proposed combo-a big-inch torquey, yet streetable, engine backed by a 2,500- to 2,800-rpm stall converter, a Turbo 400 and a 3.42 Safe-T-Track rear. Pontiac V8 Engine Bore Sizes. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. IN. 462-Inch Stroker Pontiac 400 Makes Over 500 HP, Looks Stock - MotorTrend A stroke on a stock Pontiac 400 is an important part of getting the engine to perform its best. The Pontiac 400 is a smaller, lighter engine that was produced from 1967 to 1979. But, Pontiac 400 is a single small block engine. Sherman is known industry wide for incredibly strong street engines as well as top race engines. This dramatically improved the breathability and airflow through the engine, allowing for more power and allowed for other improvements. Pontiac Stroker Kits Eagle Pontiac 400 and 455 Stroker Kits The engines feature a cast-iron block and head and two valves per cylinder. Stroking A 400 Pontiac Engine: Pros Cons And Best Practices Middleton was floored! Sherman explained to Middleton that this 462 cubic inch combination would produce 500-plus horsepower at a livable 5,000 to 5,200 rpm with almost 600 lb-ft of torque. Picking a Pontiac 400 or 455 Block for Performance Use - MotorTrend With these specs in mind, Sherman devised a plan to have the block machined and bored 0.060 over to 4.181, and to use a 4.210-inch stroke, 3.00-inch main cast crank, stock length rods, 0.030-over 455 KB hypereutectic pistons and a Comp Cams hydraulic roller cam. Trucks Invade the 2023 HOT ROD Power TourMega Gallery! 400 sbc vs 400 pontiac | Hot Rod Forum The top end recipe would duplicate his other customer's 455 with Edelbrock parts. Stock Bore 3.875 3.750 3.00 30 over 3.905 60 over 3.935 389 CU. Stock Bore 3.720 3.750 3.00 30 over 3.750 60 over 3.780 350 CU. 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. The external dimensions of all its V8 engines, i.e., from 326 to 455 cubic inches, are almost identical. 1977 ? Installing a 455 spec crank in a 3.00-inch main block sometimes . Light Em Up: Drag Racing, the HOT ROD Power Tour Way, What Is a Vista Cruiser? UCC Truck Show 2023: Maximum Performance Under Big-Time Pressure. Year (s) Bore (inches) Stroke (inches) Main Journal size (inches) Rod Journal size (inches) 265. According to Edelbrock, this combo will yield 422 horsepower and 441 foot-pounds of torque on pump gas. It was designed to be a smaller, lighter alternative to the larger Pontiac V8 engines. Its 200hp rating matched that . The 455 was a larger engine that was produced from 1970 to 1976. When Orwin Middleton of Santa Barbara, California, decided he wanted more power for the street to motivate his rare '61 Royal Pontiac Catalina, he pulled the transplanted '67 400 that sat in its engine bay and paid a visit to Joe Sherman Racing Engines in Santa Ana on the recommendation of storied racer and noted Santa Barbara engine builder, Bob Joehnck. It cannot produce enough torque and . Given the current engine technology in the Pontiac hobby, building a big-cube Pure Pontiac engine from a 400 block is easier than ever thanks to the many stroker combo choices for 3.00-inch main engines. Bore: Finished cylinder bore size, in inches that pistons are designed to work in. Keywords. Joe related, "though the carb spacer normally does lean the mixture slightly, the out-of-the-box jetting was nearly perfect for this combo. To get a 400-inch engine, Pontiac started with their proven 389-inch mill and knocked it out to a 4.12-inch bore with a 3.75-inch stroke. The Edelbrock cylinder heads have Ram Air exhaust IV portsso you should use this set of Hedman headers. Stroking an engine simply means increasing the size of the cylinder bore, which in turn increases the size of the engine. Both engines have similar characteristics, such as the same displacement, bore size, and stroke length. Mailbag: How to Get 400+HP from a Pontiac 400 Engine - OnAllCylinders Pontiac GTO 400 Engine Block Build Up - Poncho Honcho - MotorTrend Pontiac 400 Engine - High Performance Pontiac Magazine - MotorTrend Description of specs and parts included in Street & Strip 400 Pontiac rotating assembly kits. And, if you're looking for a bit more squeeze, an 11.4:1 compression ratio can be achieved with a 72-cc combustion chamber, but racing fuel will be required to get the most out of that combination. 7. To his old-world brain, these power figures bordered on Amtrak diesel territory! What is the bore and stroke on a Pontiac 400? - Short-Question For this pull, the fuel was 91-octane, the timing was set to 39 degrees and the jets were the same as listed in the engine buildup worksheet. Bore and stroke on the Pontiace 4.121 x 3.75" = 400.1. This will result in increased power and torque, as well as increased displacement. Home ; Resources ; The Pontiac Engine; The Pontiac Engine. Sherman suddenly found himself with Middleton's Pontiac engine to build as well. IN. mailbag, Pontiac 400. Most people think of the Pontaic 400 as a big block engine because of its higher displacement. The result is a pump-gas-friendly 9.9:1 (nominal) compression ratio when paired with an 87-cc combustion chamber. Dyno ResultsThe engine was dynoed on Joe Sherman Racing Engine's SuperFlow 901 engine dyno. IN. Stroking A Stock Pontiac 400: Understanding The Benefits - OsVehicle Though we typically see forged rods and pistons in these types of builds, Sherman also said that the hypereutectic pistons and cast rods would be cost-effective as compared to forged pieces, and durable in this application because peak power is made at just 5,200 rpm. Let's see how it all turned out. Wallace Racing- Pontiac Engine Bore Size's Is A Pontiac 400 A Big Block Engine? What's The Difference Between Big Coincidentally, Sherman was already in the process of building a Pontiac 455 with an Edelbrock top end featuring its aluminum heads, Performer RPM intake, 800-cfm AFB carburetor, a set of headers, and a street performance roller camshaft from Comp Cams. Of course, with modern parts it's easy to add even more . Pontiac Firing Order Pontiac V8. 326 CU. 265, 301, 307*, 326, 350, 389, 400, 421, 428, 455 1967 was the first year that the Pontiac 400 V8 switched from closed to open chamber heads. ", HOT ROD Captures the World of Racing: 1968 in Photos. Horsepower: 335@5,000 rpm. He even won the inaugural Popular Hot Rodding Magazine Engine Masters Challenge in 2002! It's 6/6, so let's talk Pontiac's 6.6-liter 400 V-8 - Hagerty Media It was designed to produce more power and torque than the 400, and was a popular engine choice for muscle cars . The 1.66-inch exhaust-valve size in the 6X heads is not the restriction in those engines- it's the exhaust system. Porting the 6X head will still realize a gain in performance, but it's not as . Stock Pontiac 400 Specs: 400 standard bore is 4.120, stock stroke is 3.750, stock rod length is 6.625, stock wrist pin size is .9805. Pontiac V8 engine - Wikipedia It includes tips and performance suggustions. April 8, 2023 by Abdul. CID: Cubic inch displacement of engine. Stock deck height on the SBC is 9.025" and the Pontiac is 10.24". What Makes This 1949 Buick Sacramentos Best Custom of 2023? 3.75-inch With a 4.12-inch bore and a 3.75-inch stroke, Pontiac's 400 had similar bore and stroke to Chevy's big-block 396 (even when the Chevy actually displaced 402 cubic inches). PONTIAC ENGINE CHART ENGINE BORE STROKE MAIN DIA. Stock Bore 4.062 3.750 3.00 30 over 4.092 60 over 4. Torque: 430@3,400 rpm. Pontiac Blocks- Bore and Stroke - Butler Performance 400 - The Pontiac Trans Am Page Pontiacs are a bit heavier and bulkier than Chevys. Advertisement. The Pontiac Engine - Butler Performance What is the bore and stroke on a Pontiac 400? The Pontiac 400 and the Chevy 400 are two of the most popular V8 engine models produced by General Motors in the United States. But in reality, it is considered a medium size level engine. Joe Sherman Racing Engine's cast crank features the 4.210-inch stroke of a 455 and the 3.00-inch mains to fit the 400 block. Cubic Inches. Compare that with a BBC's height of 9.8" and you can see that its a big engine, more like the BBC tall truck block. Pontiac 400 Engine Guide - Muscle Car Club The calendar on the wall shows it's 6/6close enough to Pontiac's iconic "6.6 Liter" badging on its Trans Am shaker hood scoops to have us thinking about everything Pontiac 400.
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