Data File:
Block: Stock GM, iron “109”, bored to 3.805, machined to Hartline specs, RJC girdle
Crank: Stock GM, 1260873, machined to Hartline specs
Rods: Stock GM, 25506520, machined to Hartline specs, Clevite 77 bearings
Pistons: JE forged, 3.805, 2618 aluminum, full floating pins...