ATK GM 383 Stroker 525 HP HP107 Stage 1 Aluminum Head

Description

Cracked piston lands and collapsed lifter bodies disable high-output service rigs under extreme highway acceleration. The ATK GM 383 Stroker 525 HP HP107 Stage 1 Aluminum Head assembly cures mechanical power limits through a commercial long block repower. This 6.3L 8-Cylinder stroker delivers 525HP, requiring installers to ensure minimum three-eighths fuel line diameter from the tank.

Constructed around an ASTM A48 Class 30 gray iron block, this ATK engine core features CNC-ported A356-T6 aluminum heads and a 4340 forged steel crank. Cold starter draw pulls 180A at 12V. Dry weight scales at 440 lbs inside 28in length, 26in width, 27in height dimensions with 5.0 quarts oil capacity.

Key Features of ATK HP107

Speed shops buy ATK GM 383 Stroker 525 HP HP107 Stage 1 Aluminum Head powertrains to capture competition-grade horsepower without sourcing separate machine shop labor. The high-lift valvetrain architecture pairs with free-breathing intake runners to maintain aggressive acceleration across the upper engine operating band.

• Displacement expands to 383ci via a 4.030in bore and 3.750in stroke forged rotating group.
• CNC-ported aluminum cylinder heads flow massive intake volume to sustain peak power past 6000 RPM.
• AISI 4340 forged steel connecting rods resist bending forces during hard trailer deceleration.
• Aggressive hydraulic roller cam profiles optimize cylinder filling through high-rpm power bands.
• HP107 commercial core balancing protocols eliminate harmonic vibrations across sustained transport speeds.
• Four-bolt cast iron main caps brace the crankshaft against severe combustion chamber loads.
• Forged aluminum dome pistons provide high thermal tolerance against cylinder detonation events.
• Multi-angle valve seats improve low-lift cylinder head airflow for instant throttle response.

Bench Dynamometer Output Data

Dyno validation confirms mechanical parameters on each HP107 long block engine prior to crate delivery. Peak output hits 525HP at 6000 RPM along with 475 ft-lbs torque at 4400 RPM. Sump oil gallery pressure registers 60 PSI hot at 190°F fluid temperature. Compression gauges show 200 PSI across all cylinders with 3% variance. Crankshaft runout checks at 0.0002in TIR. Dynamic exhaust gas temp measures 1350°F under peak load.

Integration Demands Maintenance Guidelines

Mechanical throttle lever operation needs 6 lbs pull resistance. This high-compression stroker is NOT engineered for stock low-stall torque converters, computer-controlled direct-injection chassis, or low-pressure mechanical fuel delivery systems.

• Drain break-in lubricants and renew the oil filter after 500 break-in road miles.
• Verify cold hydraulic roller preload at one-quarter turn past zero lash.
• Retorque cylinder head bolts to 70 ft-lbs after the initial thermal normalization run.

Warranty Coverage Packaged Inventory

Manufactured under the strict ATK assembly standard, this stroker engine 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 signed dyno testing sheet.