Chevrolet LT-1 5.7L V8 Remanufactured Engine – 1995 12639E

Description

Command 260 horsepower and 330 lb-ft of dyno-verified continuous torque while holding engine coolant temperatures below 195°F across grueling municipal police pursuit and transport corridors using the Chevy Caprice LT1 12639E Remanufactured Engine engineered for 1995 Chevrolet Caprice, Impala SS, and Corvette commercial fleet platforms. This Gen II small block V8 platform restores massive pulling torque and multi-shift durability.

Cast from high-density gray cast iron, this 1995 Gen II block features reverse-flow cooling passages that chill cylinder heads before the cylinder block. A micro-polished nodular cast iron crankshaft turns within tri-metal bearings, linked to forged powdered metal connecting rods and hypereutectic aluminum pistons with anti-scuff skirt coatings. Decks receive an Ra 30 finish for MLS gasket sealing. Dry mass measures 520 lbs with a 5.0-quart capacity stamped steel oil pan.

Key Features of Chevy Caprice LT1 12639E

Administrative fleet directors buy Chevy Caprice LT1 12639E remanufactured engine packages to keep municipal patrol cruisers, executive limousines, and funeral coaches running on strict operational schedules. Every remanufactured long block undergoes vacuum decay testing to guarantee total fluid circuit separation before crate departure.

• Vented Optispark II optical distributor drive systems eliminate internal condensation build-up risks
• Reverse-flow cylinder head cooling drops combustion chamber temperatures to support high compression
• In-block hydraulic roller camshaft profiles reduce valvetrain friction to enhance operational fuel efficiency
• 0.0011 to 0.0019 inch main bearing clearances maintain solid hydrodynamic lubrication film strength
• Multi-layer steel cylinder head gaskets maintain combustion seals across extreme summer transit heat
• High-volume internal gear oil pumps channel pressurized lubricant to overhead pushrods and rocker arms
• Precision rotating package balancing protects Chevy Caprice LT1 12639E driveline parts from vibration

LT1 12639E Operational Combustion Limits

Operating lubricant pressure produces 20 to 25 PSI during warm idle and expands to 50 through 65 PSI at 2400 RPM cruise speeds. Thermostats regulate internal coolant flow between 180°F and 195°F to stabilize combustion heat transfer. This 5.7-liter Gen II V8 outputs 260 horsepower at 5000 RPM and 330 lb-ft continuous torque at 2400 RPM with a 10.4:1 compression ratio. Cylinder cranking pressure measures between 175 and 190 PSI across all eight chambers. The cooling system rejects 4200 BTU per minute during full-throttle loaded climbs.

LT1 12639E Crankshaft Alignment Specs

A round 6-bolt rear crankshaft flange mounts flush to factory 4L60E automatic transmission flexplates. Measured crankshaft thrust endplay checks out between 0.0030 and 0.0070 inches. The 1.250-inch front crankshaft snout features a single keyway to position the timing crank gear and hub, holding true accessory drive serpentine belt pulley alignment.

LT1 12639E Fleet Servicing Protocols

Technicians must pre-lube the engine through the oil pressure sensor port to charge the hydraulic roller lifters before initial ignition startup. Use 5W-30 or 10W-30 motor oil meeting GM dexos standards. This commercial engine is not engineered for aftermarket supercharging exceeding 6 PSI boost, propane conversions, or drag strip racing.

• 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
• Change crankcase motor oil and replace filter every 3500 miles during severe fleet duty

LT1 12639E Commercial 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.