There does not seem to be tested and confirmed numbers that I was able to find. I have seen the chart at http://www.geocities.com/MotorCity/2824/heads.html but it does not have the combination I was looking for. Does anyone know factually what the compression ratio is for an F54 block with flat-top pistons and a P90 head combination is?

I remember a site that let you pick the head, bore, head gasket thickness, etc. and told you the ratio. I found this- http://www.geocities.com/row4navy/compression.html It's not what I was talking about but it might help.

Here's the link so you can download the L engine calculator... should give you all the info you want..

http://www.classiczcars.com/forums/showthread.php?s=&threadid=1292&highlight=L+engine+calculator