That distance still provided enough room for a 1/16-1/16-3/16 Total Seal ring package. With the 5.850-inch Molnar H-beam rods, the JE Pistons aluminum-alloy dished pistons were ordered with a 1.325-inch compression height. Stock 390 crankshaft stroke is 3.574-inch. In a slight hybrid design, the rod journals were ground for Chevy-sized 2.100-inch Clevite H-series bearings (original size was a beefy 2.250-inch). Most of the displacement increase comes from a forged-steel, 4-inch stroker crankshaft manufactured by K1 Technologies. The block was also treated to Dura-Bond cam bearings, Clevite P-Series main bearings and ARP main studs that allowed final torque of 110 ft-lb. “In case there’s a rocker arm or lifter failure,” adds McKinney. It was ground for stock AMC main bearings and 2.100-inch Chevy-size rod bearings.
Boosting the displacement up to 442ci is a 4-inch-stroke K1 forged-steel crankshaft.
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