455 exhaust manifolds

[citcapp]

I have been told that I can use a set of 350 diesel exhaust headers on my 455 engine and they will perform as well as the W30 exhaust manifolds. Is this true

Thanks for the help

[joe_padavano]

Originally Posted by citcapp

I have been told that I can use a set of 350 diesel exhaust headers on my 455 engine and they will perform as well as the W30 exhaust manifolds. Is this true

Thanks for the help

Nope.

[citcapp]

Thanks for the answer, its always great to get correct information.

[joe_padavano]

Just to elaborate on this a little, the W/Z manifolds used on the W-30s (and ALL 442s for 69-72) have individual runners like cast iron headers. The diesel manifolds are open log manifolds and since they must fit the small block, are also smaller and more restrictive.