Edelbrock heads have heli-coils in the #1/3/5 positions.

If you can use the 2.5 bolt without it bottoming in the hole........no reason not to do it.

I like the bolt to reach down into the hole as far as possible.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads