MANLEY PLATINUM SERIES Standard Pistons, -4cc FLAT TOP [Bore Size 3.905" | Rod Length 6.098" | Stroke 3.622" | Comp Distance 1.340" | Pin Diam 24mm/.945" | Piston Wt/Gms 428 | Valve Pocket Depth Int./Exh. .175"/.150"] (GM LS1, LS6 & LS2)

2618 high strength material lightweight design
Offset wrist pin design
Machined for reluctor wheel clearance
Round wire locks
1.5, 1.5, 3mm ring package
Forced pin oiling, pressure balance groove and precision pin fitting
Premium Chrome Moly wrist pins (Standard Series) included
9310 alloy .170" wall pin (Extreme Duty Series) included P/N 42542

The root diameter of the ring grooves accommodates Manley rings and others which have the following radial thickness Top: .151" 2nd: .165" Oil: .145"
Gapless Top Ring Sets are also available

Compression ratios are calculated at 0.00" deck clearance, a 9.240" deck height, and a .042" thick compressed head gasket