is this it?
GM part number: 88958786
Amazon.com: How to Build High-Performance Chevy LS1/LS6 V-8s: Modifying and Tuning Gen III Engines for GM Cars & Pickups (S-A Design): Will Handzel: Books
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not sure there are a few on amazon, guess I will just snag a few and see what I can pick up on.
There is the GM tech manual "LS1 Mechanical" not a performance thing though