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JWL · 01-14-2015, 11:30 AM

If the number 57 jets are the original design I would be surprised if the engine will run with 51's in it unless the power valve is continuously open. I have found the factory calibration to be VERY close on 390, 465, and 600 carbs when attached to our flatheads.

01-14-2015, 11:30 AM	#11
JWL Member Emeritus Join Date: May 2010 Location: Fitzgerald, Georgia Posts: 2,204	Re: 450 cfm carb. If the number 57 jets are the original design I would be surprised if the engine will run with 51's in it unless the power valve is continuously open. I have found the factory calibration to be VERY close on 390, 465, and 600 carbs when attached to our flatheads.