Quote:
Originally Posted by Tslick  A couple things, the main modification for the B55 is a new set of cams, lifters, springs etc that changes the compression ratio.
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Actually those do not affect compression ratio, which simply is the ratio between volume of the cylinder when the piston is at the bottom of the stroke compared to the volume when it's at the top of the stroke. Only by physically changing the piston, cylinder bore/stroke, or altering the combustion chamber itself, will the compression ratio change.
Cams, lifters, springs, will of course affect air/fuel flow into and out of the combustion chamber, but have no effect on it's compression ratio.