I own a 93 LT1 and two of my exhaust manifold bolts broke off in my head. My friend is going to tap them for me at his shop, but I need new bolts. I would just replace those two, but I said screw it and I want all new one's so this won't happen again. If anyone knows the size of the bolts or studs, and how many of them a full replacement takes, I'd much appreciate it.

 

I know there are 3/8-16 NC. If I remember correctly some are studs and some are bolts match them up when you take the off. Spray some WD40 or equivalent on overnight to help you remove them easier. Good luck!