383R ProStreet Stroker Crate Engine

The 383R ProStreet is a 383 cubic inch Small Block Chevy build dyno proven at ~508 HP, built with forged internals and CNC aluminum heads for serious street and strip use. The turnkey version comes assembled and dyno tested with A/C provisions in place, while short-block and long-block configurations are also available if you're building around existing accessories.

What's inside

The rotating assembly uses a forged steel crankshaft, forged H-beam rods, and a light weight forged piston set running 10 to 1 compression so it stays compatible with pump gas. A hydraulic roller cam and hi-rise intake feed the CNC aluminum heads, which use 2.02/1.60 valves. Fuel delivery is available as EFI or a carbureted setup, with alternator and power steering provisions included.

What to check before buying

This build is tuned across a 2000-6500 power range with a lopey idle, and the builder recommends a 2000-2500 stall converter to match it. Confirm your motor mounts, driveline, cooling, and brake capacity before installing, and plan on a professional install for a build this aggressive.

Common questions

Is this engine meant for daily driving? It's built for street and strip use with a lopey idle, and the listing notes it is streetable and will run on vacuum.

Does it come assembled and tested? Yes, the turnkey version is fully assembled and dyno tested before it ships.

What compression ratio does it run? 10 to 1, using a light weight forged piston set built to run on pump gas.