GMC gasoline V8 60° 637 CID (10.4 L) engines

GMC gasoline V8 60° 637 CID (10.4 L) 637 engine

It's an 637 in³ (10.44 L) internal combustion reciprocating V8 engine. It has bore/stroke ratio of 5.125 in × 3.86 in (13.018 cm × 9.8 cm), and uses 7.5:1 compression. This engine was rated 250 hp (186.42 kW) at 2800 rpm.