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Old 03-01-2014, 01:43 PM
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L31 heads are excellent on a mild 9.5:1 street 355, but when cubic inches are bigger, you need to go with bigger heads, unless you want to build a low-rpm torque motor. Then the L31's will work great, but you're still limited to 9.5:1 SCR because the heads are iron. Aluminum heads will support up to 10.5:1 SCR. More SCR supports more cam.
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