Damn then theres no point in me going to buy the bolts if theres no threading. What would the insert look like, something with threading, please explain?
Can I weld a piece of metal or cast iron or something over the hole, would that work?
Cuz if I'm gonna get a Thunder manifold later on I'd have to make the hole on that manifold bigger too, I guess that could be done though since you have to do it to 2 other holes anyway.