ATK Ford 351W 385 HP HP11 Stage 1 Aluminum Head Engine

Description

High tensile gray iron anchors the ATK HP11 Stage 1 Long Block Engine during your commercial long block repower. This 5.8L 351ci 8-Cylinder engine produces 385HP for commercial fleet transport. Install mechanics must verify intake manifold bolt torque sequence because aluminum cylinder heads require gradual step torquing to avoid intake manifold vacuum leaks.

Heavy duty ASTM A48 Class 35 gray iron casting creates the rigid 9.5in deck height cylinder block. This ATK engine core features an induction hardened nodular iron crankshaft and forged AISI 1141 connecting rods. CNC profiled aluminum cylinder heads house 21-4N valves with hardened induction faces. The 12V starter draws 175A under cold crank tests. Bare dry weight measures 475 lbs across dimensions of 29in length, 25in width, 28in height, with 5.0 quarts oil capacity.

Key Features of ATK HP11

Plant supervisors buy ATK HP11 Stage 1 Long Block Engine packages to complete a severe industrial engine rebuild with minimum equipment downtime. Precise computerized horizontal line honing ensures main bearing alignment to eliminate crankshaft journal binding under transit loads.

• A high output 5.8L 351ci small block displacement base delivers high flat-plane torque for heavy hauling.
• Two-bolt wide stance main bearing caps anchor the bottom end to stop journal deflection under load.
• Plateau honed cylinder walls allow fast compression ring seating within initial engine run hours.
• The HP11 commercial core valvetrain features hydraulic roller lifters to maximize port airflow.
• High volume oil pump gears deliver constant fluid pressure to overhead roller rocker arms.
• CNC machined aluminum cylinder heads reduce top end engine weight while improving thermal cooling.
• Deep thread cylinder head bolt bosses prevent thread distortion under severe combustion pressure.

Dynamometer Verification Operational Thresholds

Dyno load cell verification proves this HP11 long block engine produces 385HP and 410 ft-lbs of shaft torque at 5,200 RPM. Testers sustain a 2,400 RPM continuous load while oil gallery pressure holds between 48 PSI and 62 PSI. Engine oil sump temperature reads 195°F and exhaust gas heat levels reach 1,220°F. Compression testing confirms 185 PSI across all eight cylinders within 4% variance. Crankshaft journal runout measures 0.0003in TIR to verify true rotational alignment.

Field Installation Maintenance Protocols

Throttle linkage return springs must exert 5 lbs pull force to guarantee positive mechanical throttle closure. Do not drop this commercial replacement engine into lightweight passenger coupes without front suspension upgrades. Maintenance crews must carry out essential shop preventive routines.

• Perform break-in oil drainage and filter changeout at 500 miles or 25 operating hours.
• Adjust mechanical roller rocker arm adjusters cold to establish zero lash plus one-half turn down.
• Retorque cylinder head bolts to factory specifications following initial operating thermal cycles.

Crate Manifest Coverage Terms

All rebuilding methods comply with the ATK assembly standard backed by a 2-Year 24,000-mile parts warranty. The timber shipping crate houses the sealed long block core, steel oil pan, front timing cover, stamped valve covers, oil pickup tube, and the inspector verification sheet.