ATK GM 383 Stroker 435 HP HP36M Stage 2 Mid-Dress Engine

Description

Ignition timing flutter and warped intake flanges generate lean misfires in older utility trucks. The ATK GM 383 Stroker 435 HP HP36M Stage 2 Mid-Dress Engine resolves mechanical degradation with a commercial long block repower. This 6.3L 8-Cylinder stroker delivers 435HP, requiring installers to verify mechanical fuel pump pushrod length before torquing down the fuel pump body.

Constructed around an ASTM A48 Class 30 gray iron block, this ATK engine core pairs with A356-T6 aluminum heads and a 4340 forged steel crank. Cold starter draw pulls 175A at 12V. Bare weight measures 445 lbs across 28in length, 26in width, 27in height dimensions with 5.0 quarts oil capacity.

Key Features of ATK HP36M

Fleet rebuilders buy ATK GM 383 Stroker 435 HP HP36M Stage 2 Mid-Dress Engine packages to cut garage downtime through pre-assembled top-end components. The balanced intake manifold and water pump provide proven port alignment and leak-free coolant flow right out of the crate.

• Displacement reaches 383ci via a 4.030in bore and 3.750in stroke rotating assembly.
• Mid-dress assembly includes the dual-plane aluminum intake manifold and performance water pump.
• A356-T6 aluminum cylinder heads improve thermal dissipation under protracted grade-climbing stress.
• Scat 4340 forged steel connecting rods prevent rod bolt stretch under sudden deceleration.
• HP36M commercial core components receive precision dynamic balancing to reduce bearing wear.
• Four-bolt main bearing caps anchor the bottom end against high cylinder pressure forces.
• Moly-faced piston rings seal combustion gasses instantly against plateau-honed cylinder walls.
• Stellite-faced valves resist thermal recession during persistent high-load cargo transport.

Shop Test Stand Tolerances

Hot test protocols evaluate every HP36M long block engine on the hot dyno. The unit makes 435HP at 5400 RPM and 460 ft-lbs torque at 4100 RPM. Sump oil gallery pressure stabilizes at 58 PSI at 190°F operating temperature. Cylinder compression registers 195 PSI per bank with variance under 3%. Crankshaft journal runout remains within 0.0003in TIR. Exhaust gas temp measures 1320°F under maximum dyno torque absorption.

Vehicle Constraints Tuning Rules

Mechanical throttle linkage operates with 6 lbs return resistance. This mid-dress stroker is NOT engineered for factory stock catalytic converter emissions systems, daily computer-controlled computerized emissions vans, or stock low-stall torque converters.

• Change break-in engine oil alongside the oil filter element after 500 miles of service.
• Preload hydraulic lifters to one-half turn past zero lash during cold valvetrain setup.
• Confirm intake manifold bolt torque at 30 ft-lbs following initial temperature normalization.

Commercial Warranty Packaged Hardware

Manufactured under the strict ATK assembly standard, this performance stroker includes a 2-Year 24,000-mile limited warranty. The wooden freight crate contains the long block, intake manifold, water pump, valve covers, oil pan with pickup, and an official signed dyno sheet.