i have an 89 TPI car and someone recommended i do bowl work to the heds whiles its apart. i was thinkin of doin the work to the 85 heads and swapin em out. the 85s are extremely low mileage. now heres the point of this thread, which set of heads is better? im thinkin the 89 but if they are the same or by some oddity the 85s are better, can someone let me know?

 

this is long to explains o I'll try to make it quick.

89 heads are center bolt and the center bolt pattern for the tpi intake is different than 85 heads.

85 heads are perimiter botl and therefore valve covers are cheaper.

I myself currently have center bolt heads of my car, but am porting and polishing perimiter bolt heads. all you do to have the intake fit is the pre 87 heads is modify the 4 center bolt holes on the manifold.

 

i have the 85 style base too , i meant difference in runners chambers etc

 

oh , well I have no idea in differences, I just want to buy cheap valve covers lol.