These are the perfect pistons for a big-horsepower build. Originally made for the ARL engines
Stock 79.5mm bore
Pistons come with wrist pins and rings.
PD150 pistons stock size are for 79.51mm bore
PD150 pistons 1st oversize are for 79.76mm bore
PD150 pistons 2nd oversize are for 80.1mm bore
Note: When replacing the engine block, rods, crankshaft, and especially pistons it is imperative to measure piston protrusion at TDC above the block deck in order to select the correct head gasket thickness. Projection MUST fall between .91mm and 1.20mm & have the appropriate head gasket thickness to achieve the correct compression ratio.