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Old 09-18-2007, 10:24 PM
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Default Whipple pulley?

If my 3.118" pulley makes 7 lbs of boost on a 454, what will a 2.875" pulley make on the same motor?
Hp now is supposed to be 650ish. So hom much more with the added boost?
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Old 09-18-2007, 10:37 PM
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add 2-2.5 lbs or 9-9.5 lbs of boost. Should add between 50-75 hp, depending on a few variables. Eddie
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Old 09-18-2007, 11:31 PM
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Turn it up....
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Old 09-18-2007, 11:37 PM
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Originally Posted by QWKRN U View Post
Turn it up....
I got to! I got beat @ Perry. Besides, injectors & pullies were cheaper than new propellers.
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Old 09-18-2007, 11:53 PM
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Stocking up on the XR's too, I hope. LOL
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Old 09-18-2007, 11:55 PM
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I've used 2 of my spare drives, but 2 were stolen, so......
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Old 09-19-2007, 07:37 PM
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Originally Posted by JasonSmith View Post
If my 3.118" pulley makes 7 lbs of boost on a 454, what will a 2.875" pulley make on the same motor?
Hp now is supposed to be 650ish. So hom much more with the added boost?
It would put you at 9psi+/- and into race fuel. (to be safe anyway) From my experience expect no more than 50Hp more. It could be less depending on your setup.

BTW, the reliabilty goes way down at this point.
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