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11.0 to 1 with 842's and 9.5 with the 074's....and a possibility of the Domes on the Stock L-78 Pistons hitting the Combustion Chamber in the Exhaust valve area....the Closed Chamber had a straight sidewall next to the exhaust valve which shrouded it......the open has a much larger chamber, but to unshroud the valve, they open up that area, but tapered it and that's where possible contact would occur........
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Can't pull the wool over his eyes!
