Drill Guide for LS Gen III Engines

Compatible with all GM Gen III LS series engines from 1999-2008

• Used to add the necessary mounting holes in your engine block to mount a gen IV style timing chain guide (GM #12626407)
• Requires the use of Letter H Drill Size (.266") for M8-1.25 Mounting Bolts (Not Included)
• Includes: drill guide with mounting bolts
• ONLY compatible with Gen III LS Iron Blocks (LM7, LR4, LQ4, L59, LQ9)
• Made In Wichita, Kansas From aerospace grade, USA produced, billet aluminum

The holes can be drilled all the way through the engine block, IF the crankshaft is not in the block. See the video on this listing to only partially drill the holes if your crankshaft is still installed in the engine block