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The early 71s had 9 to 1 with a 74 cc head and a 1.72 inch valve. they changed the pistons to 8.5. So if your rebuilding an early 307 and its got flat tops in it, its got 9 to 1. If you got dishes or little bowls in the pistons its got 8.5 to 1.

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11y ago
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Q: What was the compression ratio of a 71 nova with a 307?
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