ATK GM 408 LQ4 Stroker 600 HP LS01 Stage 1 Engine

Description

Connecting rod bearing delamination and oil starvation disable extreme haulers under high-rpm grade climbs. The ATK GM 408 LQ4 Stroker 600 HP LS01 Stage 1 Engine solves bottom-end mechanical fatigue through a commercial long block repower. This 6.7L 8-Cylinder stroker delivers 600HP, requiring installers to match 24X or 58X reluctor wheel configurations to the engine computer harness.

Constructed around an ASTM A48 Class 35 heavy iron LQ4 block, this ATK engine core houses cathedral-port A356-T6 aluminum heads and a 4340 forged steel crank. Cold starter draw pulls 175A at 12V. Dry weight is 470 lbs inside 28in length, 26in width, 27in height dimensions with 6.0 quarts oil capacity.

Key Features of ATK LS01

Commercial builders buy ATK GM 408 LQ4 Stroker 600 HP LS01 Stage 1 Engine packages to acquire the brute strength of an iron crankcase combined with lightweight aluminum airflow capabilities. Six-bolt cross-bolted main bearing caps anchor the stroker crank against heavy combustion forces during maximum torque application.

• Generous 408ci displacement derived from a 4.030in bore and 4.000in forged steel stroker crank.
• Six-bolt cross-bolted iron main caps stop crankcase flex under brutal high-rpm operating loads.
• Cathedral-port aluminum cylinder heads accelerate intake air velocity for broad mid-range torque.
• Scat 4340 forged steel H-beam connecting rods eliminate rod fatigue under aggressive trailer towing.
• LS01 commercial core balancing isolates torsional harmonics across the broad operating RPM range.
• Hydraulic roller camshaft profile provides aggressive valve lift without manual lash maintenance.
• High-pressure oil pump delivers positive journal lubrication under high-load grade ascents.
• Multi-layer steel head gaskets seal high cylinder combustion pressures across severe operating cycles.

Bench Dynamometer Load Statistics

Rigorous test protocols measure performance on each LS01 long block engine before dispatch. Peak power attains 600HP at 6000 RPM alongside 550 ft-lbs torque at 4800 RPM. Sump oil gallery pressure registers 60 PSI hot at 200°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 1340°F under maximum dyno torque resistance.

Operational Exclusions Setup Protocols

Electronic throttle pedal pull resistance checks out at 5 lbs force. This high-output iron stroker is NOT engineered for low-octane standard pump fuels, factory light-duty transmissions, or stock restrictive truck exhaust manifolds.

• Perform full break-in oil and filter changes following the first 500 miles of service.
• Inspect pushrod straightness and rocker arm torque down to 22 ft-lbs after initial dyno break-in.
• Verify cylinder head bolt torque down to factory angle-yield specs after the initial thermal cycle.

Commercial Protection Included Hardware

Manufactured under the rigorous ATK assembly standard, this stroker engine carries a 2-Year 24,000-mile limited warranty. The wooden freight crate contains the long block assembly, aluminum valve covers, oil pan, front timing cover, oil pump with pickup, and signed dyno certificate sheet.