my Low dollar 318 hop-up project

273 said

340 wasn't actually that high of compression.
It comes down to your head flow if its close to X head flow you should be in the ballpark

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'72-3 was 8.4-8.8, I forget which. The impressive part to me is that the E58 360s that replaced them with 250hp had 7.8-8:1 compression- and they did produce results.