Page 135 of GM Performance Parts 2006 Catalog by GM Parts Direct

Production-Based Block (rear) Production-Based Block (front, top) Production-Based Block (front) 133 PRODUCTION-BASED BLOCKS The GM Performance Parts production-based blocks are the right choice for street car rebuilds or to start your own mild engine project. They come in the same dimensions that you are already familiar with and are produced to the high level of quality that GM is famous for. Remember, these are brand new castings that are machined to our exacting tolerances and delivered to you at an affordable price. These blocks are designed for street engines that demand good strength and a high level of durability. Production-Based Block Technical Notes: Cylinder walls are the same thickness as current production engines Non-siamese bores Standard 350 main journal sizes Lifter valleys are machined for hydraulic roller and flat tappets Use seal adapter P/N 10051118 to use 2-piece rear main crankshafts in these blocks See chart on page 132 for complete specifications. A. 10105123 350 Bare Block (1986-later style), 1-piece rear main seal Cast iron 4-bolt block 4.00" bore Machined for hydraulic roller or flat tappets 88962516 383 Bare Block (1986-later style), 1-piece rear main seal Cast iron 4-bolt block 4.005" bore Clearanced for 3.80" stroker crankshaft Machined for hydraulic roller or flat tappets 10066034 350 Bare Block (pre-1986 style), 2-piece rear main seal Cast iron 4-bolt block 4.00" bore Can be used for 302, 327, or 350 engines Machined for hydraulic roller or flat tappets Used on 1973-85 GM Goodwrench 350 engines Straight Four-Bolt Mains A A A A

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