ATK HP36 GM 383 Stroker 435HP Stage 1 Aluminum Head Long Block Crate Engine

Description

Drop quarter-mile elapsed sprint times using the ATK HP36 Long Block Engine in Stage 1 aluminum head dress. Displacing 383 cubic inches, this stroker engine generates 435 horsepower at 5,400 RPM and 460 lb-ft torque at 4,100 RPM. The long block format provides builders freedom to install their custom carburetion or electronic injection packages.

The build starts with a seasoned 4-bolt main cast iron GM block clearanced for stroker counterweights. The rotating group combines a 4340 forged steel 3.800-inch crankshaft, 5.700-inch 4140 forged steel I-beam rods, and 10.0:1 hypereutectic pistons across a 4.000-inch bore. A 5-quart passenger-side dipstick oil pan and double-roller timing set complete this rigid stroker crankcase package.

Key Features of ATK HP36

Drag racers buy ATK HP36 crate engine packages to drop proven small-block stroker torque into muscle cars without personal machine shop fees. This unit repowers vintage C10 pickups, G-body muscle cars, and early GM roadsters with immense torque.

• 4340 forged steel crankshaft handles sudden dragstrip torque shock loads without crankshaft deflection or snout breakage.
• 64cc aluminum heads lower front-axle vehicle weight while promoting accelerated heat rejection under high engine loads.
• 190cc intake runners channel rich fuel mixtures smoothly through 2.02-inch intake and 1.60-inch exhaust valves.
• 0.528-inch lift roller camshaft profiles accelerate valve opening velocity for sudden acceleration off the transbrake or street stop.
• 220-degree intake duration at 0.050-inch lift ensures a wide powerband spanning from 2,400 up to 5,800 RPM.
• Full roller rocker arms with 1.5:1 ratio stop friction build-up on valve tips during extended wide-open throttle pulls.
• ATK HP36 long block packages feature a hardened distributor drive gear compatible with cast iron and melonized gears.
• Pre-installed valve covers and front timing cover seal the engine against dirt entry during chassis installation.

Dyno Certification Output Band

Dynamometer runs verify 435 brake horsepower at 5,400 RPM alongside a broad 460 lb-ft torque curve peaking at 4,100 RPM. The engine maintains steady 14 in-Hg manifold idle vacuum to actuate street car power brake servos without reserve canisters. Engineered for 91-octane service station gasoline, the lubrication system sustains 40 to 65 PSI oil pressure during sustained road operations.

Bay Packaging Transmission Drop

External envelope dimensions mirror standard small-block Chevrolet blocks, ensuring drop-in placement between classic A-body and F-body frame rails. The rear crank flange requires an external-balance flexplate or flywheel to mate with automatic or manual transmissions. Motor mount points accept factory GM clamshell or polyurethane performance mounts without header interference.

Pre-Run Setup Misuse Prohibitions

Prior to turning the ignition switch, pressure-feed the lubrication passages using an engine primer tool to wet the crank bearings. Fill the crankcase with 10W-30 mineral break-in oil fortified with zinc additives. This power unit is not built for boat marine drives, continuous forced-induction boost beyond 6 PSI, or unmetered nitrous systems.

• Drain the break-in lubricant and mount a fresh spin-on oil filter after completing the first 500 street miles.
• Inspect valve train action and check accessory belt drive alignment every 3,000 miles of vehicle operation.
• Examine external oil pan bolts and inspect cooling system integrity every 12 months or 12,000 highway miles.

Warranty Statement Physical Contents

ATK covers the engine with a 24-Month or 50,000-Mile limited warranty for authorized recreational street applications. The wooden crate holds the pre-assembled long block, aluminum cylinder heads, stamped valve covers, front timing cover, oil pan, and certified dyno test report sheet.