MANLEY PLATINUM SERIES Extreme Duty Pistons [Bore Size mm 84.50 | Over Size +0.5mm | Rod Length 5.683" | Stroke mm 89.6 | Comp Distance 1.276" | Dome Volume (cc) -10.5 | Cyl Head (cc) 37 | Comp Ratio 10.2 | Piston Type Dish | Piston Wt/Gms XXX] (BMW N55 & S55)

2618 high strength material
Offset wrist pin for quiet start-ups
.210" wall Premium Chrome Moly pin (Standard Series) included P/N 42451
9310 alloy .210" wall pin (Extreme Duty Series) included P/N 42551
Pressure balance groove
Will accommodate +1mm valve sizes
Premium Steel top rings with Napier seconds and round wire locks included
Recommended piston clearance .0035" measured .850" from the bottom of the oil ring