i have a set of xw exhaust manifolds and i was wondering if they are a good replacement for headers because i dont have 500+ to dump in g body 455 headers. also how much do you guys think i should sell my intakes for?, one is a B casting one is an X casting, im not real familiar with stock intakes and dont know how much they are worth if anything at all. also how much j heads are worth because i have a set i need to sell but dont know what kind of price to put on them because i know there smog crap heads. thanks

 

There are more than one "X" manifold and more than one "W" manifold. What are the casting numbers on yours?

 

w: 389268

x:389269

 

Unfortunately, those are the open log manifolds. X was used on 1965-68 400 motors in A-body cars and W was used on 1965-67 400 motors. In a best-to-worst ranking of BBO manifolds, these are near the bottom.

What you want are the 402295 W or 412287 X manifold for the LH side and the 402294 Z manifold for the RH side. These are the divided runner manifolds used on 442s and W-cars.

 

could you use Sanderson or Hedman shorty headers??