Compression?

[90Ranger302]

Could someone tell me what my compression would be? 302, .030 over pistons with 8cc dish volume and Gt40P's shaved .030. I want more compression but not to much. I am hoping for about 9:5 to 1.

Thanks
Bob

 

[Rick 91GT]

What is the cc chambers on a GT-40P

This is with a 60cc chamber and a -.010 deck which is about stock, if you go 0 deck (have the block decked to 0) you'll have 9.1:1

Bore 4.03 (inches)
Stroke 3.0 (inches)
Rod Length 5.09 (inches)
Cyl. Head Vol. 60 (cc)
Deck Height 0.010 (inches)
Head Gasket Bore 4.10 (inches)
Head Gasket Thickness 0.039 (inches)
Piston to Cyl. Wall Clearance 0.003 (inches)
Top Ring Land Height 0.25 (inches)
Piston Dome Vol. -8.0 (cc)


Compression Ratio:
8.98 : 1

Bore / Stroke Ratio:
1.343 : 1

Rod / Stroke Ratio:
1.697 : 1

Total volume:
705.785 cc's

Compressed volume:
78.593 cc's

 

[Grn92LX]

Rick, did Jay ever get back to you about the differences in those two compression calculators?