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on a 470bb with a mp .590 solid,11.1 comp.,how much hp difference from a head that flows [Email]290@.600[/Email] vs [Email]315@.600?thanks[/Email],sam.



There is not a real simple answer to that question. By the time you subtract valve lash, pushrod deflection, and a few other factors your 590 lift cam is not 590. When porting a set of heads they should be customized to match the customers combo. It is real easy to reach for that high flow number only to have mid lift numbers and air-speed suffers. Most guys use the simple factor of 2hp per 1 cfm but a lot of things come into play.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

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