TTA heads on a GN?


Jan 13, 2007
I have a set of ported cylinder heads from an 89 Turbo Trans Am that I want to use on my 87GN. Are they interchangeable without major modifications? I know that the mounting for the valve covers are different, if there is anything else please let me know. Thankyou!!
The exhaust manifolds are different as well.

Contrary to popular belief, they do NOT flow as well as the 8445 heads. Stick to what you have or get some ported 8445 heads.

Billy T.
Yep, Not worth the trouble. Sell those and get a nice set of GN1's.

Id suggest simple ported 8445's. He can get into those for almost nothing if he sells the TTA heads. That is if they are the correct castings for a TTA. They are crack prone anyway.