If you're starting from scratch, consider the cost of sonic-checking, pressure-testing, and machining an old block before you ignore the option of spending more bucks on a new one. Beyond that, we recommend stepping up to an aftermarket block. OEM 1966-67 Chevrolet Chevelle Malibu SS Impala 4 Retaining Rings &. GM rates the original small-block cylinder case at no more than 360 hp, but we've seen them stay together at 600 hp or more by stabilizing the bores with a block fill ( is a well known supplier) up to the water jackets. I purchased a 1982 El Camino that I restored with a Chevy 350 crate engine and a. ![]() Each of the tests found maximum power with 34. Cooling the engine also becomes an issue with an overly large bore. The camshafts were run with a dual-plane Edelbrock Air Gap intake manifold, a 750-cfm Speed Demon carburetor, and set of 131/44-inch Hedman headers. ![]() Look closely at the sonic check results and you'll see how thin the cylinder walls of a stock block are when you bore them to 4.125 inch. ![]() At what point do you sell your stock block and invest in an aftermarket one? Engine design will dictate an upgrade if you plan to increase the stroke of the crankshaft beyond 3.800 inches or bore it more than 0.060 inch.
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