454 big block chevy gen 6

454 big block chevy gen 6 7.4 mercury magnum 425 marine dyno tested

Newly rebuilt gen -6 454 big block chevy 4 bolt main block chevy steel crank and 3/8 heavy duty rods forged pistons hyd roller cam s st. valves 3/8 push rods heavy duty valve train isky springs retainers and locks. 9/1 compression aluminum intake . new fasteners ,balancer , flywheel ,valve covers all included engine is dyno tested after sale with your carb and dist. or we can supply them so the engine is dialed in with the components that it will run with.