Compression Ratio?

[TexasJet]

Is there a formula to figure out the running compression ratio. A friend of mine has a 454 with 7.5 to 1 pistons. He is running a small blower with 5 Lbs. of boost. What would his true compression ratio be? Thanks.

[Infomaniac]

A few of the Blower Mfg sites have this info.
Blower Shop, BDS, Kuhl etc. Just search around.

[Fiat48]

http://www.goodvibesracing.com/Compression%20Ratio.htm

[TexasJet]

Fiat48, thanks for the link. :)