Boost Ready® 408 Engine

Description

Command 850 horsepower and 780 lb-ft of dyno-verified continuous boost-rated torque while holding engine coolant temperatures below 200°F across grueling commercial pursuit transport operations using the Boost Ready 408 Stroker Remanufactured Engine engineered for extreme-duty commercial truck and security transport platforms requiring forced induction. This stroker iron-block Gen IV LS platform restores immense low-end pulling power and structural durability.

Cast from high-density gray iron, this 6.0-liter iron block is precision bored to 4.030 inches with thick cylinder bulkheads that resist boost deflection. A 4.000-inch stroke forged 4340 steel crankshaft turns within coated tri-metal bearings, linked to forged 4340 H-beam connecting rods and forged 2618 aluminum pistons with dish crowns. Decks receive an Ra 25 finish for MLS gasket sealing. Dry mass measures 525 lbs with a 6.0-quart capacity steel oil pan.

Key Features of Boost Ready 408

Specialized fleet managers buy Boost Ready 408 remanufactured engine packages to power severe-duty transport haulers and tactical pursuit trucks under sustained forced induction boost. Every remanufactured long block undergoes vacuum decay testing to guarantee total fluid circuit separation before crate departure.

• 4.000-inch stroke forged crankshaft expands displacement to 408 cubic inches for massive torque
• Forged 2618 alloy pistons resist thermal expansion and detonation scuffing under 22 PSI boost
• Forged 4340 H-beam connecting rods with ARP 2000 bolts resist extreme cylinder pressure spikes
• 0.0022 to 0.0028 inch main bearing clearances maintain solid hydrodynamic lubrication film strength
• Multi-layer steel cylinder head gaskets maintain combustion seals across extreme summer boost heat
• High-pressure high-volume internal gerotor oil pumps channel positive lubrication to hydraulic roller lifters
• Dynamic rotating balancing protects Boost Ready 408 driveline transmission parts from vibration

Boost Ready 408 Operational Limits

Operating lubricant pressure produces 25 to 32 PSI during warm idle and expands to 60 through 75 PSI at 3000 RPM cruise speeds. Thermostats regulate internal coolant flow between 185°F and 200°F to stabilize combustion heat transfer. This 408 cubic inch stroker V8 supports 850 horsepower at 6200 RPM and 780 lb-ft continuous torque at 4600 RPM with a 9.8:1 compression ratio. Cylinder cranking pressure measures between 170 and 185 PSI across all eight chambers. The cooling system rejects 5500 BTU per minute during full boost operation.

Boost Ready 408 Crankshaft Alignment

A 6-bolt rear crankshaft flange mounts flush to heavy-duty 4L80E or 6L90 automatic transmission flexplates. Measured crankshaft thrust endplay checks out between 0.0030 and 0.0070 inches. The 1.259-inch front crankshaft snout features a single keyway to position the timing crank gear, holding true supercharger or accessory drive serpentine belt pulley alignment.

Boost Ready 408 Fleet Protocols

Technicians must pre-lube the engine through the main oil gallery port on the front driver side before initial ignition startup. Use 15W-50 or 5W-40 full synthetic motor oil meeting high-zinc performance standards. This high-output engine is not engineered for naturally aspirated low-octane pump fuel, propane conversions, or marine salt water use.

• Inspect engine oil level and coolant recovery tank fluid each shift before vehicle dispatch
• Drain break-in motor oil and install fresh oil filter after 500 initial road miles
• Perform routine oil and filter changes every 3000 miles during severe commercial service

Boost Ready 408 Warranty Manifest

Commercial fleet purchasers receive a 3-Year / 100,000-Mile commercial fleet warranty covering structural casting and internal moving components. The heavy-duty wood crate contains one remanufactured long block engine, a complete engine install gasket set, spark plug well seals, front timing cover seals, dyno test documentation, and priming instructions.