428 Compression Calculator

Simply fill in the form below to calculate your compression ratio.

Bore (diameter)

Stroke

Cylinder Head Volume

Effective Dome Volume(-) dome, (+) dish

Deck Clearance

Compressed Gasket Thickness.040 is standard thickness

Number of Cylinders

428 Block — Displacement Reference

Over	Bore	4.00" stroke	4.21" stroke	4.25" stroke	4.50" stroke
Stock	4.120	427	449	453	480
+.030	4.150	433	456	460	487
+.035	4.155	434	457	461	488
+.040	4.160	435	458	462	489
+.060	4.180	439	462	467	494
+.065	4.185	440	463	468	495