Found a 351 windsor, was going to rebuild the 302 but I am basically getting the 351 for free, so its basically a wash with between building the 351 and the 302, I have a set of 302 headers I got for $20.00, hate to not use them, how much of a difference is there between the 351 and 302 headers? I have torches and welders so tweeking is not a problem.

 

From what I've read, the 351 headers hang down a bit further than the 302 headers since the Y pipe is in the same location.

 

none really....

the 351 is 2 inches wider do to the deck height... it can still work if the 302 arent that tight...I've used 302 headers on a 351 for torque apps