Will aftermarket headers from a 2.2 cobalt bolt to my cav head? I did some searching on the interchangeable parts but found nothing.
 
Yes but with an a caveat.
It can be very very close on some, and may require a little hammering. It all depends on the brand and quality of the part though.
 
DRIVING FORCE FABRICATIONS
 
Thanks for the info I’m going to order a set I can’t find any reasonably budget friendly headers for the cavy.