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Thread: Mercury 280 head
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01-08-2018, 05:32 PM #1
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Mercury 280 head
Is 38 cc the tightest head can run on pump gas on a 280? Buying billet heads and want to make sure get right chambers for boating. Thanks.
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ironhead stv liked this post
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01-08-2018, 06:10 PM #2
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Steve ,I'm running 34.5 c.c on pump 91 would think 38 could run 89 octain
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01-08-2018, 08:02 PM #3
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You have to remember the exhaust port timing on a 280 is lower than the 260s and stock they make 150-155psi. I wouldn't go any tighter on the crappy pump gas in my opinion.
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