CHEVY 421CI
If 406 is good, then 421 must be better. Adding significantly more torque with increased cubic inches is the tried and true method to building a more powerful engine. Power your next race car with a CHP 421 Pro Mod.

421ci Street Fighter Pro Street
4.145 to 4.165 bore - 3.875 stroke - Flat top piston
• Forged steel crankshaft
• CHP Lightweight forged steel connecting rods (6.000)
• Probe PRS forged pistons
• Dished and Blower Dish pistons available
• Solid flat tappet camshaft
• Edelbrock "Victor Jr" cylinder heads

Need a turn-key combination for your project car? CHP has the answer. Call your CHP customer service representative for friendly assistance with completing your CHP crate motor. CHP can supply everything you need for your application with a wide variety of oil pans, intake manifolds, balancers and flywheels etc. to make it work for you. We can even run your engine in to insure a trouble-free installation. All you’ll have to do is install your crate motor.

Kits include: crankshaft, connecting rods, pistons, wrist pins, rings, and rod and main bearings.

Shortblocks include: all of the above installed in an appropriate engine block. The assembly is balanced and blueprinted.

Need a turn-key combination for your project car?

CHP has the answer. Call your CHP customer service representative for friendly assistance with completing your CHP crate motor. CHP can supply everything you need for your application with a wide variety of oil pans, intake manifolds, balancers and flywheels etc. to make it work for you. We can even run your engine in to insure a trouble-free installation. All you’ll have to do is install your crate motor.