Size and length of header bolts? for stock headers?

[Brian Mc]

Can anyone help me? i am 500 miles away from my car but near a good hardware store and need to know the length and thread of the stock header bolts. If you know how many need to be studs and which don't that would help too. Thanks a lot.

 

[Ormand]

Odd ball..

Several are the funky stud-on-a-bolt things, you can only get at a GM dealer. The stud part is M8X1.25X20, the bolt part is 3.8-16. I guess you can use 3/8-16 bolts everywhere, but then you have to figure a new way to mount the brackets that would otherwise attach to the studs.

 

[turbofish38]

The info from the GM parts book states the short ones are 3/8-16X.92 and the long ones are 3/8-16X1.87 and the stud length on the ones that use them as M8X1.25X20.