exhaust manifolds question

[tommytpk]

Hi,
Got my hands on a 455 from a 74 toronado, and the exhaust manifolds are stamped J and H. Is either one usable on a G-body (79 Cutlass), or should I be looking at headers or W/Z manifolds?

Thanks--
Tom

 

[84dragcutlass]

I would go with finding a set of W/Z manifolds. They make them new and they aren't that expensive and will work on your car. The headers that are made for G-Bodys one tube wraps around the frame and I personally have never cared for them. They add an extra headache to wheel and tire clearance among other issues. Some like them some hate them. From the info ive seen there isn't much power advantage between the W/Z manifolds and headers on most street engines