Im throwing them on my lt1 and they bolt up fine. However SLP headers have those damn bolt guides on both sides, one in the front and one in the middle. I solved this for 3 of the guides by using the old exhaust manifold bolts and spacers.

However the middle passenger side guide is too damn long. I seriously want to smack the **** out of whoever at SLP designed these like this because no bolt head I have even fits trhough the guides.

I even called slp and asked if they used special bolts and they said their standard 3/8 x 1" bolts, nothing special and told him there is no way in hell I can get that bolt through that guide and his answer was to go one thread at a time. The damn guide is almost 1 & 1/2 times longer than the bolt, what the hell is he talking about.

Im seriously considering pulling out my dremel and getting rid of this crappy design flaw.