I have a 68 400 engine (9790071) in my 67 GTO. It had old headers on it that I'm getting rid of and replacing with manifolds. I attached photos. They are the d ports and not the round ports. The engine is standard, not HO or Ram Air. I'm having a hard time finding just standard manifolds through the online part stores. Is there any reason I cant use the HO or Ram Air manifolds provided they are d port and right size? If there isnt, is there any reason why I wouldnt do that vs. trying to find the standard? I'm replacing the entire exhaust system .... Thanks in advance for your feedback!
84.9 KB Views: 126
91.5 KB Views: 107