📍 It provides the best horsepower-per-cubic-inch ratio for a conventional deck big block. PAR Racing Engines' 615 Big Block Chevy Engine
Naturally aspirated versions typically produce 1,000 to 1,300+ HP depending on the top end. 615-bbc-short-block
Most 615 short blocks utilize a and 4.625" stroke combination. 000 to 1
Forced induction builds from shops like Steve Morris Engines have pushed this displacement past 3,000 HP . 615-bbc-short-block
The 615 is the "weapon of choice" for racers who want maximum cubes without the bulk of a tall-deck engine. For the best results, look for kits or assemblies from established shops like Shafiroff Racing or PAR Racing Engines.
The 4.625" stroke requires extensive internal machining for rod-to-cam and rod-to-block clearance.