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Bored&Stroked · 05-09-2020, 08:52 PM

I'd first clean up the heads and check the dome shape of them as compared to the EGGE pistons. I've seen two distinctly different dome shapes on the V8 Flatheads - some of the cast pistons have very different more elliptical profiles than pistons like Ross - who have a consistent radius. Once you know if you have a chamber shape issue, then you can review your options. Just to bring up an issue - one should never assemble these engines with aftermarket heads/pistons without claying the chambers and seeing what clearances you have. The goal is to get to .040 to .050 over the pistons (with gaskets installed) - this gives the best performance. Given you already have the heads off, it would seem like the easiest solution is to modify the profiles in the head chambers. It would be easy to use a CNC milling machine to redo all of them with a chamber that works with your pistons - that would be my approach.

05-09-2020, 08:52 PM	#2
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,068	Re: Egge Pistons and Aluminum Heads I'd first clean up the heads and check the dome shape of them as compared to the EGGE pistons. I've seen two distinctly different dome shapes on the V8 Flatheads - some of the cast pistons have very different more elliptical profiles than pistons like Ross - who have a consistent radius. Once you know if you have a chamber shape issue, then you can review your options. Just to bring up an issue - one should never assemble these engines with aftermarket heads/pistons without claying the chambers and seeing what clearances you have. The goal is to get to .040 to .050 over the pistons (with gaskets installed) - this gives the best performance. Given you already have the heads off, it would seem like the easiest solution is to modify the profiles in the head chambers. It would be easy to use a CNC milling machine to redo all of them with a chamber that works with your pistons - that would be my approach.