Swapping an LS1 motor in my 7 and the engine didn't come with manifolds. I just needed to know what length and thread bolts i need to bolt the stock exhaust manifolds up.

 

Well I happen to have one in my hand. The threads are 6mmx1.00 and the lentgh is 4.5 inches from the bolt end to the bottom face of the washer. They have a washer that is retained on them though and they look pretty OEMish, but the manifold is all O-ringed so an off the shel alternative may work?

 

That sounds like an intake bolt. The exhaust are 8X1.25 if I remember correctly. Can find out later at home or maybe someone else can confirm.

 

Yep, I just saw manifold. I have an extra set as I just took off my stocks and will be using ARPs I'll measure them and get exact in awhile.

 

4.5 inches did seem a little long.

 

Think I will let that one go by

 

Exhaust manifold bolts are 8mm x 1.25 x 1.00 inch

 

that would be 8mm x 1.25mm x 24mm (if it is longer, then 30mm long)