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Old 11-02-2011, 07:50 PM
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Compression numbers on a '70 250hp 350

I'm getting high numbers (highest i've ever gotten) on an unmodified 350. Lowest is 170 and highest is 179 averaging 174.5. The heads are 441s. I have read that these haeds are 76cc but I have also read that they could be 72cc. The motor has 104500 miles unrestored. It did run strong. Are the numbers high?

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Old 11-02-2011, 08:17 PM
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My '71 service manual for 245hp 350, 8.5:1 CR

160psi, cranking speed, wot, max variation 20psi

441 heads - 250hp, 1.94/1.50 valves, 76.26cc chambers
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