Whats the thread size on the exhaust manifoild bolts ? I have upgraded my manifoilds to bigger pipes, and now im having problems to tight the screws firewall side, so i need some new bolts whit torx or unbraco.

its a 1986 mod , 2,8 v6 . btw

Should be metric m8x1.25

Thanxs

You might want to get an HF caliper and measure the depth. 40 to 50 mm seems to be right for stock manifolds, but all engines/holes may not be the same. You may be able to find heat-treated bolts of this size at hardware stores.