Zr1bandit

Anybody have any experience with the Thornton repo W Z exhaust manifolds for the big block 455 ???

66luvr

Lots of us have used them including me. They are great, and I have never heard a negative comment.

anthonyP

Is there any advantage to the Thornton reproduction W/Z exhaust manifolds in comparison with OEM W/Z manifolds?

Olds64

Yes, the Thornton's manifolds are readily available at a decent price. If you look for OE manifolds you run the chance that the owner will want an arm and a leg for them since they are original parts. Plus, OE manifolds might be damaged.

joe_padavano

The real benefit is that originals will be badly pitted from rust. The repros will not.

anthonyP

Thanks for the information. I was thinking that Thornton might have had improved the flow characteristics.

Olds64

As far as I know, they are an exact replica of the OE parts.

grmchne78

Has anyone used W & Z manifolds on a GBody?

classicmuscle442

Have a set on '70 W30, stored originals.