Quote:
Originally Posted by 77 TRASHCAN
I calculated the compression ratio on my 1970 350 using 6 cc's dish for reliefs, .020 in hole with the 90 cc chambers, got 7.74:1. A long way from the 8.8:1 factory advertised...LOL no wonder I could run 44 degrees total timing and NOT make the thing ping. Has a 066 cam in it...
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I had a stock 70 350 and cc'd the heads about the same "89cc". with the stock cam it used to pump around 135psi i think.