ATK HP36 Chevy 383 Stroker Base Engine 435HP

Rated at 435 hp and 475 lb-ft of torque, the ATK HP36 runs AFR's aluminum heads, 72cc chambers and 180cc ports, with valves sized at 2.02/1.60, a different head casting than ATK uses on some of its other 383 stroker builds.

Who this engine suits

The bottom end leans on Scat too: a nodular-iron crankshaft and matching forged connecting rods, fastened with ARP 8740 hardware, running forged pistons at 10:1 compression. This is a bare long block: ATK leaves the Edelbrock dual-plane intake, carburetor, HEI distributor, and water pump off, listing them only as suggested parts for the builder to add.

What this tier leaves out

• Balancer, flexplate, and flywheel are not part of this base build, all left for the installer to source.
• ATK's parts sheet for this cam calls for a noticeably higher stall-speed converter than its milder 383 engines; ask us for the exact figure before ordering a torque converter.
• This compression and cam pairing wants premium-grade gasoline.

Common questions

Is there a carburetor on this engine? No, the carburetor, intake, distributor, and water pump are left off; ATK lists them only as suggested parts.

Why AFR heads instead of Dart? ATK pairs this particular 383 build with AFR's 180cc-port castings rather than the Dart heads used on some of its other stroker engines.

What's the compression ratio? This combination runs 10:1, a notch below ATK's highest-compression 383 stroker engines in this lineup. California requires BAR compliance for engine swap installations.