77 Trans Am 6X-8 to a 6X-4

[pete315]

I just bought a 77 Trans Am from original owner with 72,000 miles. I'm assuming it has the 6X-8 heads. My friend has a set of rebuilt 6X-4 heads he never installed on his car. Would I see a noticeable increase in power with these heads on? Timing chain has never been replaced so I want to change that right away. Is it worth swapping heads and leave the stock 6X-8 cam in car? Or should both the heads and cam be changed to notice any improvement in power? I'm guessing the 6X-8 cam is different than the 6X-4 cam. Thanks for any info.

[b_hill_86]

I don’t pretend to be an engine guru but the 4s are smaller chambers which will bump compression up a little which won’t hurt. Would a new cam work better with the slightly higher compression? Probably but I can’t say for sure. Check out performance years forum. Lots of engine gurus on there that can accurately answer your questions.