ATK GM 383 Stroker 415 HP HP94 Stage 1 Aluminum Head

Description

Deck warping and valvetrain chatter cause persistent power drops under demanding service conditions. The ATK GM 383 Stroker 415 HP HP94 Stage 1 Aluminum Head assembly resolves mechanical fatigue via a commercial long block repower. This 6.3L 8-Cylinder stroker churns out 415HP, but mechanics must verify distributor gear end play against the machined engine block boss.

Constructed using an ASTM A48 Class 30 gray iron block, this ATK engine core pairs with premium A356-T6 aluminum heads and an AISI 4140 forged steel crankshaft. Starter draw demands 170A at 12V. Bare weight equals 440 lbs inside a 28in length, 26in width, 27in height envelope holding 5.0 quarts oil.

Key Features of ATK HP94

Commercial shops buy ATK GM 383 Stroker 415 HP HP94 Stage 1 Aluminum Head packages to gain immense mid-range punch without paying custom machine shop labor rates. Premium fasteners and hardened valvetrain components maintain baseline clearances through thousands of severe operating cycles.

• Increased 3.750in stroke crank produces heavy pulling torque across lower engine operating bands.
• Lightweight aluminum cylinder heads improve heat conduction to prevent pre-ignition ping under heavy load.
• Hydraulic roller camshaft minimizes valvetrain friction while avoiding high-zinc oil dependencies after break-in.
• Full-floating piston wrist pins reduce pin bore galling during high cylinder pressure events.
• HP94 commercial core architecture includes four-bolt main caps to minimize crank flex.
• Stainless steel intake and exhaust valves resist corrosive combustion byproduct pitting.
• Double roller timing chain sets preserve camshaft synchronization through severe engine braking.
• Tri-metal engine bearings provide high embeddability for micro-debris particle isolation.

Bench Dynamometer Verification Tolerances

Hot bench runs verify tolerances on every HP94 long block engine before dispatch. The stroker delivers 415HP at 5200 RPM and 440 ft-lbs torque at 3800 RPM. Oil gallery pressure indicates 56 PSI hot at 190°F fluid temperature. Cylinder compression gauges show 185 PSI across all cylinders with variance under 4%. Crankshaft journal runout records 0.0002in TIR. Dynamic exhaust gas temp stabilizes at 1310°F under peak absorption loading.

Chassis Clearances Routine Maintenance

Throttle bracket return springs demand 6 lbs pull force. This stroker unit is NOT designed for late-model computer controlled vehicles with direct injection, transverse chassis layouts, or stock low-pressure mechanical fuel pumps.

• Replace break-in lubricants and spin-on oil filter after completing 500 initial vehicle road miles.
• Set hydraulic roller lifters to one-half turn down past zero lash when performing cold adjustments.
• Retorque intake manifold perimeter bolts to 30 ft-lbs after the second complete thermal cooldown cycle.

Warranty Coverage Packaged Inventory

Manufactured according to the rigorous ATK assembly standard, this assembly carries a 2-Year 24,000-mile limited warranty. The reinforced shipping crate houses the long block, aluminum valve covers, oil pan, front timing cover, oil pump, and an official signed dyno report sheet.