Products specifications

Block Height	10.195
Fitment	Engine Specific
Bore	4.625
CID	638
Comp Height	1.12
Comp Ratio @ 65cc	16.5:1
Comp Ratio @ 70cc	15.7:1
Comp Ratio @ 77cc	14.6:1
Dome Volume	-7.3
Gram Weight	583
Oversize	0.025
Rod	6.7
Stroke	4.75