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Old 05-16-2013, 11:59 AM
Asur Asur is offline
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Engine Octane values for an engine are based on the Compression ratio, the 4.7 has a Compression Ratio 9.8:1, this engine can run on 87 Octane, the 5.7 engine has a compression ration of 10.5:1, its recommended Octane is 89. but can also run 87 without knocking.

And Yes snrusnak is correct, 2 valves per cyl

Last edited by Asur; 05-16-2013 at 12:18 PM.
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