Hi all just wondering will the headers for a chevy 305/350 fit a 307? I mean visually from looking olds has the peak in the center and less bolts but most headers i see that are not insane on price that "fit 85 307" on sites are sbc flange and i really don't want to take my manifolds off to see if the heads are indeed able to accept them being that leads to new bolts and the task of possibly removing ones that break just to find out otherwise. I have the time currently to do it ( Covid-19 travel restrictions and shutdown job) but don't want to have my car in pieces to find out olds headers only.

 

No, they will not bolt to the Olds heads. Sorry.

 

Chevy exhaust flange:





Oldsmobile exhaust flange:

 

Yea i knew the difference even though for some reason my manifolds have 2 holes between the center and end ports but only are bolted next to the center. Just get thrown off by summit giving me a part number to headers that should fit but they have a chevy flange. Long tube's are cheap enough for olds just have clearance issues being the 307 was not meant to be in the Omega manifolds clear fine but headers would be tight and require some fabrication and moving pipes then welding back together to clear the starter and control arms properly so nothing hits and it won't cook the starter. Just needed to be sure olds didn't double pattern heads or anything. Thanks for the input guys much appreciated.

 

Summit, Jegs, et al pretty much list EVERY Chevy part as fitting an Olds, since the Chevy-centric world assumes every non-Chevy has had an SBC swapped into it.