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Your compression ratio is a bit low. Why did you drop it to 9.5:1? With the aluminum Edlebrock heads, 10.5:1 should have been easy.

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Aha! That might explain it. The engine has the same pistons from decades ago and I'm just working with what I got. Pistons are TRW L2385's and compression might actually be 8.5 to 1 ? I think my heads are 63 cc's

Next 340 that I build will have higher compression and that Ritter aluminum block