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

Description

Connecting rod bolt interference against custom camshaft lobes causes sudden internal engine destruction in modified street builds. The ATK GM 383 Stroker 435HP HP36 Stage 1 Aluminum Head Long Block eradicates clearance contact during this commercial long block repower. This 8-Cylinder 435HP stroker platform requires external balance flexplate weight alignment before torque converter installation.

ASTM A48 Class 35 iron forms the four-bolt main block with clearance-machined oil pan rails. A 4340 forged steel 3.750in stroke crankshaft drops into hypereutectic pistons and A356-T6 aluminum heads carrying 2.02in intake valves. This ATK engine core demands a 12V 175A starter draw during high-compression cold cranks. Dry weight measures 410 lbs within a 29in length, 26in width, 27in height stance accepting 5.0 quarts of oil.

Key Features of ATK GM 383 Stroker HP36

Chassis builders buy ATK GM 383 Stroker HP36 Aluminum Head Long Block units to eliminate valvetrain geometry errors. Every industrial engine rebuild features CNC clearance cuts along the internal block casting pan rails.

• Cylinder bores measure 4.030in with diamond plateau hone finishes.
• Main bearing journal clearance holds at 0.0016in across all five main saddles.
• Full roller rocker arms maintain true 1.5 ratio valve action.
• Hydraulic roller camshaft lobes deliver rapid valve opening ramp rates.
• Multi layer steel head gaskets resist high-compression cylinder detonation.
• This HP36 commercial core receives computer spin balancing within two grams.
• High-flow aluminum intake runners promote optimal air-fuel distribution.

Dynamometer Load Verification Bench

Automated brake cell runs document that this HP36 long block engine produces 435 continuous BHP and 460 ft-lbs of torque at 4200 continuous load RPM. Internal oil gallery pressure measures 58 PSI while oil sump temp settles at 192°F under peak torque loading. Exhaust gas temp tops at 1340°F down the test header runners. Compression checks record between 185 PSI and 192 PSI across all eight chambers. Crankshaft center journal runout holds within 0.0003in TIR.

Field Installation Diagnostic Protocol

Mechanical throttle return springs require 5 lbs of pull force to guarantee positive carburetor butterfly closing. This stroker motor is not engineered for marine sterndrive duty, wet-exhaust salt environments, or computer-controlled transverse passenger chassis.

• Drain initial break-in zinc petroleum oil after 500 miles or 20 run hours.
• Set hydraulic roller lifter preload to one half turn past zero lash cold.
• Torque cylinder head bolts in three passes to 70 ft-lbs final specification.

Commercial Warranty Delivery Package

The rigorous ATK assembly standard provides a 2-Year unlimited-mile limited parts warranty. Each secure pallet shipment includes the complete long block core, oil pan, front timing cover, aluminum valve covers, oil pump pickup screen, and a certified technician dynamometer test sheet.