Deck Height Diagram
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When building a mild Small-Block performance engine or a replacement for a stock engine, GM Performance Parts’ brand-new, production-based blocks 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.
CHEVY SMALL-BLOCK V-8
Production-Based Blocks Production-Based Block (front)
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
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See the chart on page 134 for complete specifications
A. 10105123 350 Bare Block (1986–Later Style), 1-Piece Rear Main Seal • Cast-iron 4-bolt block • 4.000" bore • Machined for hydraulic roller or flat tappets
Production-Based Block (rear)
19171109 383 Bare Block (1986–Later Style), 1-Piece Rear Main Seal • • • • •
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10066034 350 Bare Block (Pre-1986 Style), 2-Piece Rear Main Seal • • • • •
Straight 4-Bolt Mains
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Production-Based Block (front, top)
Cast-iron 4-bolt block 4.005" bore Torque plate honed Clearanced for 3.800" stroker crankshaft Machined for hydraulic roller or flat tappets
Cast-iron 4-bolt block 4.000" bore Can be used for 302, 327, or 350 engines Machined for flat tappets only Used in 1973-1985 GM Goodwrench 350 engines
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Available for purchase online at gmperformanceparts.com
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