[sagacious]

Im using Federal Mogul hypereutectic flat tops with 4 valve reliefs. the part no. is: H345ncp. can anyone help me figure out how many cc's these valve reliefs add? these pistons are very common but im having a hard time coming up with the numbers to figure out my compression accuratly.

the block has been decked, tho it's nearly stock.. maybe 5,000ths of an inch shorter im told.
.040 gasket size.
H345ncp hypereutectic flat top /w 4 valve reliefs
76cc heads.

the closest numbers im getting with a little guesswork is about 9.4:1. anyone have any ideas? thanks.