The Chevrolet Performance LS Series Engine Blocks are driving a new generation of enthusiasts by providing a foundation for serious performance achievements. The LS3 blocks are designed specifically to handle from 450-900 horsepower. No matter if you are building a mild street engine or more radical race engine, the LS3 is a proven foundation to start with.
Features:4.065" finished bore size
6-Bolt Cross-bolted Main Caps
Strong and Lightweight Aluminum Alloy Casting
Provisions for the latest in Engine Control Management