i have a pair of headers that came off a 302 but will they fit my 351w if not is anyone willing to swap me!!

 

Aftermarket cylinder heads (the reason why i say aftermarket is because i know that stock 351 heads are 1/2" bolts and 302's are 7/16") will go on either engine. the exhaust pattern should be the same. The only thing that i cn think of is that the deck height on a 351 is over an inch taller than a 302 so clearance may be an issue, but i'll tell you i had plenty of room butting headers on my 96 302/331.