Pro Tru sets include plasma moly 1/16, 1/16, 3/16 pre-gapped ring packages which provide excellent seal, friction reduction, and long life. Pro Tru pistons also come in a variety of volumes that allow the engine builder to choose the exact compression ratio required for their engine.
Bore (in):3.346 in.
Piston Style:Dish, with four valve reliefs
Piston Material:Forged aluminum
Compression Distance (in):1.130 in.
Piston Head Volume (cc):+21.00cc
Wrist Pin Style:Press-fit or floating
Pin Diameter (in):0.866 in.
Top Ring Thickness:1.0mm
Top Ring Material:Steel
Top Ring Facing Material:Gas nitrided
Second Ring Thickness:1.2mm
Second Ring Material:Cast iron
Second Ring Facing Material:Phosphate coated
Oil Ring Thickness:2.8mm
Oil Ring Material:Stainless steel
Oil Ring Tension:Standard
Quantity:Sold as a kit.
Notes:Fits 4G63 engines, second generation 7-bolt with 100mm stroker crankshaft. Pistons include .225 in. wall tool steel pins.
Part # K627M85AP