The crate GM 355 has standard factory exhaust manifolds. I recently picked up a pair of ramhorns for a SBC. I have finally gotten around to making the switch, but I have a couple of questions?

1. The left hand manifold had a "shelf" built into the front port, what is that for?

2. Where can I locate replacement bolts for the manifold to exhaust pipe flange? Also where can I locate bolts to secure it to the block?

3. The right hand manifold came with a spacer where the exhaust pipe ties in, is that needed or can I not use it?

The ramhorns I purchased



My engine with its current exhaust manifold