Originally Posted by
FFR428
Same heads. Only difference for the GT's was better valvesprings for the GT cam. C8AE-H's were used on the 360, 390 and 390GT engines. Later D2TE-AA heads are the same only with induction hardened ex seats. Which after a few valve jobs are moot point anyway.
Personally I'd stick with the C4's.
So actually, if I did go with the 390 GT heads, being that I'm going for new valve springs, rockers, etc, the C8AE-H would be identical? Because I have a set of C8AE-H heads available to me much cheaper than the GT heads. But would I be better staying with that design, or the C4 heads? Which has better flow characteristics as stock, no porting valve improvements, anything? Also, the same question on compression, which would be better?