Tag: LS1 block deck

LS1 cylinder head alignment dowels locate the heads accurately on the block before the fasteners are tightened. Learn where all four dowels install, how to seat them and why damaged or missing sleeves should never be ignored.

Before installing the cylinder heads, check the LS1 block deck for warpage. Our LS engine reference specifies maximum flatness of 0.004 inch within 6 inches and 0.008 inch across the deck.