Production-Based Blocks

When building a mild Small-Block performance engine or a replacement for a stock engine, brand-new, production-based blocks from Chevrolet Performance give you strength, accuracy and peace of mind that can’t be assured in a rebuilt core. And unlike so many of the used cores, ours all feature four-bolt main caps for extra strength – there’s no reason to settle for a two-bolt block. Each new cylinder block is machined to production-spec tolerances and is manufactured to the exact specifications of pre-1986 or 1986-later engines.
Production-Based Block Technical Notes:

• Standard 350 main journal sizes
• Non-siamese bores
• Production-spec cylinder wall thickness
• Lifter valleys machined for hydraulic-roller and flat-tappet valvetrains