A “30 over” means .030″ and your new bore is 4.28″.
That’s because the classic Mark IV big block is limited to a maximum overbore of around 0.100-0.125 inches. On a 454ci engine with a stock 4.00 inch stroke, a .100 inch overbore gives 476 inches of displacement, while a .125 inch overbore gives a rat of 481 inches.
454 cu in (7.4 l) 496 cu in (8.1 l) Nur Aftermarket: 502 cu in (8.2 l)
Even with Generation V/VI revisions, the displacement of the 454 remained constant for decades until GM radically changed the big block and brought a production truck engine to 8.1 liters (496 ci), which was released in 2001 on the market came. Bore stayed at 4.250, but stroke increased from 4.00 to a hefty 4.37 inches.
If I do the math correctly, a 454 has a 4.25 stroke and the cylinders are stamped out . 060 gets you a 496 if you use the stock 4 maintain ” and bore . 060 you have 468.
Our 454/468 hydraulic camshaft motor generates 600 hp power at approx. 5800 rpm.
Take a 454, add a 4,250 inch lift crank along with some 6,385 inch rods and your displacement skyrockets up to 489cc. Now bore those cylinders something up, let’s say. 060 inches above and you end up at the venerable 496.
Re: How much power with a 2-bolt main engine 454
a 2-bolt main engine supports 450 hp for short periods of full load if it has a steel crank. However, I wouldn’t recommend attempting a 450 with a cast crank. The 330 should be a 4 hole main block.
Where a given engine falls depends on many factors, so we use 1.3 hp per cubic inch as the average. This means that a 454 can support almost 600 hp (454 x 1.3 = 590.2). In fact, many do. With the same multiplier, a 496 can support 645 hp.
The 454 Big Block is a very good engine if you are looking for something that can put out a lot of power and will fit in many classic cars and trucks. This is a classic Chevrolet engine that produces tremendous power straight from the factory. If you upgrade it, you can get even more out of it.
At 1,005.8 ci, the “Godfather” is the largest big-block engine ever built. Large is a relative term as it always requires some level of qualification or comparison to justify it.
The Chevy 8.1-liter engine – also known as the Vortec 8100 – was the final breath of big-block V8 production for the iconic Bowtie brand. We check its performance, which allows it to last up to 250,000 miles. The term “big block” is most associated with classic muscle automotive Americana.
The 496 Stroker HP High Performance Crate Motor includes forged pistons, 4340 rods and HP aluminum heads so you don’t have to sacrifice quality to get a big block at a great price. This engine requires at least a 3000 stall converter when using an automatic transmission.
Big Block Generation V(5) Chevrolet Engine Differences
These were manufactured from 1991-1995 and were only available in a 454 cubic inch configuration. They had a one-piece rear main seal, oil passages closer to the cam, and each block received a four-hole mesh. Gen 5 BBC has cast aluminum valve covers and front covers for a better seal.
A factory 496 (8.1L) is 4.25″ bore x 4.375″ stroke.