TTA heads on a GN?

[MoscaP87]

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!!

 

[Jan Larsson]

Headers would be different I take it ....

 

[jdsgnx]

i have a gn and a tta blocks are the same, you will need to use tta head bolts and get a set of tta headers these are different!!!!!!!!

JD

 

[TT/Ameasap]

Also

Remember that the TTA pistons are different.

 

[trading t/a]

The flanges are different comparing both headers. If you were to fab up a different header flange and tig them to the GN primaries it may work. I'm not sure about the distance between the exhaust ports though, it may be different....

 

[skturbo]

You cant change the flanges. The tubes wont line up.

Steve K.

 

[trading t/a]

There's your answer, Steve would know better than most........