Piston Top Aprox. Comp. Ratio:

+4cc Dome Top Gen III Hemi
Chamber Comp Ratio
65 12.56 to 1
74 11.23 to 1
85 9.98 to 1

 

For accurate Comp Ratio info use the calculator below.

Compression Ratio Calculator

Engine Brand: Mopar

Engine Family: Small Block Mopar Hemi Gen III

Engine Size: 392 - 6.4

Cylinder Bore Size: 4.100 in , 104.058 mm

Ring Groove Width: 1.2/1.2/3MM

Compression Height: 1.210"

Pin Diameter: 0.945"

Connecting Rod Length: 6.200"

Crankshaft Stroke: 3.720"

Cylinder Head: Gen III Hemi

TDC Assembly Height: 9.270" ( Zero Deck Height )

SKU K1-6837-4125
Brand DSS Racing