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I don't have flat tops, but I was cracking rings on my 100mm with rings that came with my JE 9.5:1,
single plug hemi head location and 8 psi boost don't help, lol.
I had Total Seal figure out what I needed, they were worth every penny and the tech support was great.
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Kuehl
1987 911 cab, modified
https://griffiths.com/
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