Chev 502 GM Marine Mercruiser 8.2L Long Engine 425HP # L502MCHEV 502 MARINE MERCRUISER 8. 2L LONG ENGINE # L502M BRAND NEW 502ci base marine engine (standard rotation) made for 1991 2002 marine engine applications. Engine includes block, 8. 2L (502ci) rectangular port cylinder heads, valve covers, forged steel crankshaft, high performance cam shaft, 8 quart marine oil pan, harmonic balancer, roller cam, corrosion resistant black urethane paint, spark plugs and all internal parts. One piece rear main seal (also