Hi. I bought a jet boat with a Chevy 283 and the don't know what carb is on it. I think it's a 650 cfm and think it maybe a clone not sure. If it's a 650 anyone know what the jetting should be for a mild Chevy 283? Right now it has 68 for primaries & 77 for secondaries. Has a 6.5 power valve and the squirters are 28 primary and 32 secondaries. It's running rich just looking for a good starting point for tuning after I know what size it is. Thanks fort the help.
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