Experience The Power Of The 2001 Pontiac Grand Am GT: 175 Horsepower And Fuel Efficiency At Its Best! Additionally, the Pontiac 400 can be stroked up to a whopping 4.56 inches, resulting in an amazing 481 cubic inches of displacement. 97 jets square, 0.030/0.020 valve lash, and 31.5 degrees timing produced 650.4 hp at 6,300 and 596 lb-ft of torque at 4,900 rpm. Most Pontiacs were built with the 400 engine when it first became available in 1967. The special edition black and gold Trans Am made famous by Burt Reynolds in the Smokey and the Bandit movie franchise increased Firebird sales in 1977 and 1978 and made the 400 V8 quite popular. 4-barrel versions of the Pontiac 400 V8 ranged in power from 330 horsepower to 370 horsepower in the days before gross horsepower ratings. This odd fact shows how Pontiac strived to keep the muscle car flame lit. It is a popular choice for hot rods and muscle cars, and many enthusiasts have put a lot of time and effort into building up these engines. The Pontiac 400 has a displacement of 6.6 liters. The PN 500557 remained the foundation for every other 1978 400, including the standard engine in the Trans Am while the PN XX481988 was limited to the T/A 6.6 only. The basic 421 became a regular production option in 1962 and the 421 H.O. This engine was initially produced in 1967 and has remained a popular choice for performance enthusiasts ever since. If the engine hasn't, you might find the original plug very tough to break free, possibly rounding out during the attempt. Shifts around 5500-5700 Pontiac's Ram Air and H.O. By the end of this article, you will have a better understanding of the horsepower potential of a Pontiac 400 engine and be able to make an informed decision about whether it is the right choice for your muscle car. The Ford 332 (4.4 litre) Interceptor big block V8 engine is a well-known engine for its power, reliability, and affordability, as is the Ford Ranger. It was introduced in 1926 as a spin-off of the Oakland Motor Division, filling a gap in GM's product lineup between Chevrolet and Oakland. Q: I want to build a Pontiac 400 engine. Lunati springs, locks retainers In terms of size, Chevrolet comes in at a very low level. The engine in Semcos Pontiac 409CI exemplifies the companys ability to overcome the most stringent engine limitations, demonstrating how even the most difficult engines can be built. Some like to compete in the high-compression horsepower chase and some look to push the boundaries of the pump-gas combo. There is a long thread in Py that is still active. During the 455's run, Pontiac developed and created the Super Duty 455, which was a beefy mill designed for the rigors of continuous high-rpm racing. A new camshaft and low-restriction exhaust system added 20 more horsepower for 1978, and the increase had a noticeable effect on vehicle acceleration. What parts would I need to build a sweet-running engine that makes around 400 horsepower? In the process, Pontiac improved cylinder-head airflow by decreasing valve angle from 20 degrees to 14 and adding larger intake and exhaust valves. Typical preparation of a stock Pontiac block at Butler Performance is very straightforward. that came with it. Engine needs a refresh. I've noticed in the later production years, Pontiac's high-quality machining standards diminished. While such castings will certainly bolt on, the low-deck design of the 90-degree 301ci block brings the cylinder heads closer to the crankshaft centerline, which in turn requires an intake manifold with shorter runners to maintain proper port alignment. Engine blocks, in addition to producing such impressive power, are also extremely unique in their engineering. The simplest way to find a Pontiac 400 engine is to look in the cars catalog. The engine was tuned to generate 360 horsepower and 445 foot-pounds of torque, or pulling power. Theres no reason to go beyond 460 when boring to060 over for a 400/455 stroker, and youll be fine with 4.18 on the 400. The Firebird 400 is a car from Pontiac, with rear wheel drive, a front mounted engine and a 2 door coup body style. Please see upgrades section for a list of possibilities. The Comp hydraulic roller cam penciled out at 234/238 with .540/.548 lift on a 112 LSA. After the 455 was introduced on the Bonneville, it was discontinued. For the exhaust side, a set of reproduction Ram Air exhaust manifolds-or better yet, 131/44- or 171/48-inch primary headers-twin cats and true 2.5-inch exhaust will free up some power. Mr. P-Body, as opposed to the 455, has a 4.25/3.0/6.8 combo due to a rod/stroke ratio (1.9 for the 455 and 1.57 for the P-Body) and the smaller rod and main bearings. I realize the tech guys try to sell certain products but outside the heads and intake Edelbrock leaves a lot on the table with their generic cams and carburetors. For 1968, Pontiac produced three different versions of the 400, one with a top speed of 330 horsepower, the other with a top speed of 335 horsepower. Thinkin about that and Starting with a low-deck block, engineers removed enough material from it and a number of other conventional engine components to just meet minimum durability standards. We recommend them when horsepower reaches 600 and feel they're required when horsepower reaches 650. The PN 485428 was replaced by the PN 500813 for 1975. While it was fairly reliable when operated within its intended range and a decent performer in the right application, the engine was designed for maximum economy, which severely limits performance. There are some parts that can be bolted to all of these blocks, but they are unlikely to work. Street performance combos include 389-400-428-455 block, 91+ octane, hyd. We learned during tuning that advancing the timing past 32 degrees had a detrimental effect on power and the heads made peak power with 31.5 degrees of total timing. I need advice on building a stout 400+ hp engine & looking to get great torque numbers. As a result, the blocks of all Pontiac V-8 models from the 287 to the 455 are the same size and very similar in weight, making it more difficult to identify the 11 different engine displacements produced between 1955 and 1979. Pontiac's 400 Multiple block codes were used to complicate the problem, as date codes can overlap for up to three decades. We have been using longer-than-stock rods to reduce side loading to help eliminate the need for block filling in many applications. Therefore, while they may look similar, the Pontiac 400 and 455 are not the same block. The cylinder bore and stroke of the engine, which measured 4.25 inches in length and 1.25 inches in width, is used to calculate distance traveled. Pontiac began developing an all-new, 287ci V8 also slated for 1955. The aftermarket has continued to grow, and many blocks now have more torque and power than SD blocks. The bore and stroke, or length and width of the cylinder, of the engine, were measured at 4.125 and 3.75 inches. Running HEI ignition w HO coil. The casting code is 481988XX to distinguish the W72 from the '71-'75 castings that have 481988. A given camshafts peak torque range can be optimized to ensure that more than 100% VE is achieved. Mr. P-Body has a 4.25/3.0/6.8 combo due to the rod/stroke ratio (for the 455, its 1.6% vs. This engine was utilized in a variety of Pontiac vehicles, including the Pontiac Firebird and the Pontiac Grand Prix. It was punched 0.035-over and stuffed with a 4.210-inch stroke crank. We also deburr the oil galleries and restrict oil feeds where necessary too. JeffMG on Twitter: "RT @Vfabry: 1968 Pontiac Firebird 400 Introduced Pontiac's popularity was such that by 1932 GM actually dropped the Oakland and renamed it "Pontiac Motor Division." over the last few years. The Power And Durability Of The Pontiac 400 YS Engine In the 1970s, a 1970 Pontiac 400 block was stamped with the displacement along the left front edge to ensure its strength and durability. Pontiac 400 Poncho Engine Build - A 650HP Hard-Core Pontiac Stroker If You Own A Pontiac And Were Considering Bolting In A Big-Block Chevy To Make Some Real Horsepower-Shame On You! Will this two-bolt main 400 block fitted with go-fast goodies make 600-plus hp on the dyno on 93-octane and live to tell the tale? The 350 horsepower engine can be street-legal by removing a small block of 350 horsepower. The Pontiac 400 is an iconic V8 engine that has been around since the late 1960s. We took the question to David Butler of Butler Performance in Lawrenceburg, Tennessee, for his professional opinion. Putting together the engine, wiring it up, and ensuring that all street equipment is operational is a difficult process. In the end, No. Horsepower increased on the 400 CID V8 for the first time since 1974. Do I have a nice combination to make 300 to 300-plus hp at the rear wheels?Doug SchroederVia Internet. The 400 was inspired by the Pontiac 389 V8 and proved to be the last Pontiac engine with closed chambered heads. You may have a Bird that will be worth some decent money soon, so keep this in mind before you decide to do modifications. The two engines share some similarities, as they were both produced by the Pontiac Motor Division of General Motors and have the same 4.125-inch bore, but the Pontiac 455 has a larger 4.15-inch stroke, resulting in a larger displacement of 7.5 liters. ", Just how much horsepower a stock Pontiac 400 or 455 block can handle is a question that Butler has been asked countless times over the years, and he says there isn't a straight answer. Building The W72 For Hot Street PerformanceI have a question about the W72 engine, which I want to modify for more power. The PN 9792506 was carried over into 1968 for Ram Air applications, while Pontiac created the PN 9790071 casting for two-bolt applications. In engines of 1.0 litre or less, there are usually three or four cylinders, with some engines using turbochargers for extra power. 9, which is what everyone tries to sell me. We work with the Summit Racing tech department to help you tackleyour auto-related conundrums. When the 400 engine was introduced in 1967, it was standard equipment for the vast majority of Pontiacs. cure. It makes no difference how powerful a 400 Pontiac engine can be with it. Maximizing Your 400 Horsepower: Building A Pontiac 400 Engine The Pontiac 400 block was decked and squared, then fitted with billet-steel four-bolt main caps before punching the block .060-inch over. "In the 1990s, before aftermarket Pontiac V8 blocks were available, we had to push the stock Pontiac blocks a lot further than we do today. I had the block gone through and balanced. On Py, there is still an active thread running. Pontiac V8 History I have a '78 Grand Prix that I would like to rebuild, but I'm not sure what other Pontiac parts will interchange with my 301ci engine. The main journal bore grew by 0.250 inch to accommodate the 3.25-inch-dimeter main journals of the new crankshaft with a 4.00-inch-long stroke. We took that up with the professionals at Butler Performance, and here's what they had to say. A History Lesson in Pontiac V8 Power - Engine Builder Magazine No, a Pontiac 400 and a 455 are not the same block. The need for Pontiac to require two identically machined blocks remains unclear, and in rare instances we find where Pontiac used the PN 9799914 or PN 9799915 interchangeably. Fun For 301I'm not new to owning Pontiacs, having had three Grand Ams and a sweet little Fiero, but I've never built one up for show. 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. UCC Truck Show 2023: Maximum Performance Under Big-Time Pressure. For a few years, the 400 has been a bored out 389. What about heads? Although they wouldnt compete with the 350, 305 cars were the only vehicles that made it. 48 heads. Edelbrock Performer aluminum cylinder heads, Edelbrock Performer RPM Intake Manifold for Pontiac 400, Edelbrock Performer & Performer RPM Cylinder Heads for Pontiac 400. Boring the engine out to its maximum of 4.15 inches will result in a displacement of 455 cubic inches, providing plenty of power for those looking for a powerful engine with plenty of torque. The manifold I have for it is the edelbrock Torker 1 Light Em Up: Drag Racing, the HOT ROD Power Tour Way. I have a 77 Bonneville with only 53 K miles on it with the 180 hp 400 engine . No stock rods in this engine we use only Eagle connecting rods. Today's Pontiac hobby seems vehemently divided when discussing the Division's death. The V8 engine in a Pontiac is the same size as that in a Pontiac. The revised 400 block was ushered into production in approximately February 1975, and the new PN 500557 casting went on to become the foundation of every 400-inch application through 1977. The plug covers a direct path used during initial machining to bore an internal oil passageway that was subsequently tapped and sealed off during production. Edelbrock Performer & Performer RPM Cylinder Heads for Pontiac 400 It is commonly assumed that a smaller engine size improves fuel efficiency. Finally, Ill relocate my bird so that it can live the rest of its life in a comfortable environment. What Makes This 1949 Buick Sacramentos Best Custom of 2023? Car: 1979 Trans Am with TA/6.6--400 engine--an original L-78/W-72 220 net hp engine with 6X-4 heads and 8.1.to 1 compression This version of the Pontiac V8 engine was used in the GTO, Firebird, and the Trans-Am Firebird. And, it has only a 110 LSA. For 1968, Pontiac produced three different versions of the 400, one with a top speed of 330 horsepower, the other with a top speed of 335 horsepower. Charlie 1979, et voila (21 years and counting). At midyear, the 335-bhp Ram Air mill was replaced by the 340-bhp Ram Air II. For a time, the 455 seemed a commodity and usable cores were quite valuable, with asking prices of $1,500 or more not uncommon. The newer blocks' main caps never seem to be aligned properly. Moving all of the torque they have at their maximum rpm will result in a significant amount of power being produced by them. It has the same adv duration @ 301/313, but about 4 less intake dur @ .050 lift. A billet distributor, with the correct color cap, combined with a set of Blue Max 8mm plug wires handles the spark duties on this disguised stroker. No matter how you perceive Pontiac's discontinuance, there's no denying that vintage Pontiac V8 performance is alive and well. The result is 350 horsepower with a 400 pontiac engine. Maximizing Performance: How To Get 400 Horsepower Out Of Your Pontiac cam 472Lift and 296Dur. I just saw your answer to a Jeremy Cook concerning upping the HP on his 68 Firebird 400 engine . The Chevy Camaro 396 had a larger block than the Pontiac Firebird 400. torque. Torque was 563 at 4,600 rpm. In 2004, Pontiac brought back the GTO nameplate to the United States as a rebadged Holden Monaro coupe, with the following model year seeing an increase in power of up to 400 hp, thanks to the 6.0-liter LS2 engine, which was the same engine in the C6 Corvette. This is due to the right engineering of big block engines like the Ford 332 (5.1 litre). If that is even too much, there are the 068 & 744 clones, which have barely over .400 lift. Performer RPM intake UCC Truck Show 2023: Maximum Performance Under Big-Time Pressure. I bought the car in 1976 with 52,000 miles on it. As the overall size of General Motors' vehicles grew year over year during the late 1960s, so did the need for additional displacement to maintain sufficient acceleration. Keep us updated on how the engine works by following Charlies advice. Thanks. A two-barrel producing less horsepower and higher torque was developed. The Pontiac Firebird 400 is a rear wheel drive automobile, with its motor located in the front, and a 2 door coup body. I like to build engines because Im very particular, so Im not sure if Id go with a forged crank, 4340 I-beams, or lighter race pistons. Edelbrock Torqer 2 Manifold. And an open hood scoop, A hood scoop kit. Despite its iconic status in Pontiacs most brutal and outrageous muscle cars as well as its resistance to smog-choked, low-compression lameness in the modern era, the 400 remains a favorite V-8 engine. The results of this recycled-power project are pretty impressive when it's dyno time. Keep your compression ratio at about 9.5:1. These include a 301 horsepower engine and a 265 horsepower engine. The same holds for the hydraulic-roller series XR264HR and possibly XR276HR. Loyalists hold firm that it occurred in December 2009 when the last new Pontiac was officially produced, while purists argue that Pontiac ceased to exist after March 1981 when the last true Pontiac V8 was assembled and installed into a Pontiac vehicle. The Pontiac 400 engine is often praised for its durability and power, making it a great choice for many classic and muscle car owners. Pontiac Catalina - Wikipedia Pontiac 400 Engine - High Performance Pontiac Magazine - MotorTrend Check out the details and pictures at . Original 48 heads reconditioned, milled .010, with Manley SS valves KRE's aluminum D-ports are available in three different chamber sizes-65, 74, and 85 cc-and are CNC-ported to flow 310, 325, or 340 cfm. Is it better to rebuild the transmission and then rebuild the rear end? The 400 pushed this number up to 360 horsepower, with the same Quadrajet single four-barrel. 400 Pontiac Crate Engine With 450HP | Proformance Unlimited During the 1970s, nylon timing gear was common in motors, but in most cases, it had rusted and needed to be replaced. In the end, the Semco engine produced an incredible 561 horsepower, making it one of the most powerful engines ever built for such a demanding task. Because the pistons in the 400/455 are lubricated with 455, it is actually less expensive to build one. 650+ HP Pontiac 400/487 cu.in. Several threads have appeared in the last few years that discuss the possibility of installing a Pontiac engine in the 3rd Generation. 10 photos FAST XFI Sportsman System, FAST 4150 Black Anodized Throttle Body, Pontiac Edelbrock Victor 1050 Intake, Edelbrock Aluminum Heads, Comp Custom Cam, Johnson lifters, GZ Evac Pump System, Custom Butler Valve Covers, and much more . You see, as Pontiac increased the stroke length of its cast crankshaft past 3.75 inches, it also increased the diameter of its main journal to ensure it retained sufficient (connecting rod and main) journal overlap to maintain planar strength, and the stock 455 crank provided racers with displacement and durability. Additionally, the two engines have different valve sizes, with the 400 having a 1.96-inch intake valve and a 1.66-inch exhaust valve and the 455 having a 2.11-inch intake valve and a 1.77-inch exhaust valve. This engine, despite its higher compression ratio and larger bore, generated more power. Making 547 hp and 635 lb-ft of torque from a stroked Pontiac 400 - Hemmings After running through the break-in procedures, the timing was adjusted to 34 degrees and a best pull was made of 512 hp at 5,400 rpm and 556 lb-ft of torque way down at 3,900 rpm. Pontiac didn't sit back and take GM's directive lightly, however. This is the opposite of what most hobbyists do! The engine was available in both the Firebird and the GTO models, and it was designed for performance. Am putting an Erson HI Flo 1 hyd. The factory fasteners are pretty durable, but even the newest ones are pushing 40 years old. Required fields are marked *. The project is most often abandoned for one reason or another, and the threads come to an end. Hey Jeremy, let me try my best to get you a more precise parts list. He tore his rear end in half by slamming his 350 into a 360-degree turn. Horsepower on the standard 400-cid V-8 increased by five, to 330. Porting the 6X head will still realize a gain in performance, but it's not as important when utilizing 400 ci.
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