Well I thought maybe I could drill the head out too if I had to I'll just check and make sure the bigger hole doesn't interfere with the fire ring on the gasket. Never used a helicoil before but I think there not too difficult My main concern is if there enough meat on the block itself so I'm not drilling into the cylinder wall and I also thought about dropping down to a 5/16 bolt if I used a helicoil but not familiar with drill sizes for the helicoil it may require a bigger bit for a 5/16 helicoil than the bit for a 7/16 bolt I just don't know but I will find out and I appreciate all you all's help
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