Quote:
Originally Posted by 68c10owner
With flat top pistons those heads usually give about 9.5:1 compression which is perfect. The smaller valves were great in engines like this. Once you start running more camshaft and winding it up higher you might see a increase in performance. Stock is 2.065/1.72 and the factory big valve heads use 2.19/1.72 on the closed chambers and 2.19/1.88 on the open chambers. You would possibly see a difference with some mild pocket porting and bowl work but stock they will perform well
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Thanks for the input. It runs really well but I think it can do better with some minor messaging. It is (or I thought it was) bone stock and complete. No leaks, no smoke. Compression is 160, give or take, across the board with a constant 15 vacuum. I'll eventually tear it down and do some nasty mods but for now, headers.
You guys are a great help! Stay safe and healthy!