Accuracy of this.

[Steve.k]

Have you guys used this just wondering how accurate? I see John on here maybe he knows. one.http://www.wallaceracing.com/calcafhp.php

[cjperformance]

Yes, its a good basic rule of thumb quick way to help the thinking process and show the minimum you can make with an otherwise reasonable combo.

[pastry_chef]

IMO compression ratio should also be added as a factor.

[Steve.k]

Well if its accurate my heads to small