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Running the kb400 pistons to keep compression up. Tough with the short stroke of the 383. This was a budget build for a street car. Pistons are about 50 thou in the hole. Was running before with the 915s before I had to tear it down. Calculated compression pretty much bang on 9 to 1

Thought I'd get an opinion before I toss my engine back together. The 915s from 67 have the smaller exhaust valves and closed chambers. The 452s are open chamber but have a bigger exhaust valve. Curious if the 452s would be more beneficial with the bigger exhaust valve despite a drop in...

Yeah that's why I was hesitant to consider flat tops with no reliefs. Thanks again.

Any idea which flat tops you were using? Did they have valve reliefs?

From what I understood the effective volume of the valve reliefs and dome equals 0cc. The dome itself is 6cc

I guess I'll have to see how far down in the bore they are sitting and determine the actual compression ratio and factor in quench area to decide if it will work with pump gas.

Thought of that but I might go to aluminum heads later anyway. Already spending a bit on machine work. Heads are good otherwise. Hoping the longer duration on the exhaust side will help a bit.

In the middle of a tear down on my 383 after breaking a skirt on cylinder 4. Found out piston selection is pretty scarce for the 383. Ended up ordering the kb400s which is a 6cc dome to try and bump compression. This is what I plan on running: 1967 383 bored 30 over Edelbrock Performer rpm...