Chevrolet Performance 19260741 Crate Engine Assembly

Description

Flat tappet camshaft lobe wiping from modern low-zinc lubricants causes severe valvetrain clatter on classic work trucks. The Chevrolet Performance 19260741 Crate Engine Assembly restores lost volumetric efficiency across this commercial long block repower. This 8-Cylinder 290HP small block requires high-zinc break-in oil additive during the first twenty minutes of camshaft run-in.

Dense ASTM A48 Class 35 cast iron forms the monolithic four-bolt main crankcase and perimeter-bolt cylinder heads. A nodular iron 3.480in stroke crankshaft connects to powdered metal rods and aluminum cast pistons inside line-honed cylinders. This Chevrolet Performance engine core demands a 12V 165A starter draw during cold shop cranks. Dry weight measures 430 lbs within a 28in length, 25in width, 27in height envelope holding 5.0 quarts of oil.

Key Features of Chevrolet Performance 19260741

Fleet rebuild technicians buy Chevrolet Performance 19260741 Crate Engine Assembly packages to eliminate assembly turnaround delays. Our industrial engine rebuild standard uses brand new factory iron blocks and precision-ground valvetrain hardware.

• Cylinder bores measure 4.000in with diamond plateau hone surface finishes.
• Main bearing journal clearance holds at 0.0014in across all five main saddles.
• Hydraulic flat tappet camshafts deliver broad mid-range operating torque.
• Cast iron cylinder heads feature 76cc combustion chambers for pump gas compatibility.
• Multi layer steel head gaskets lock combustion pressures inside cylinders.
• This 19260741 commercial core features factory precision spin balancing within two grams.
• Stellite faced exhaust valves resist seat recession under sustained highway loads.

Dynamometer Load Verification Bench

Factory dyno cell records certify that this 19260741 long block engine produces 290 continuous BHP and 326 ft-lbs of torque at 3750 continuous load RPM. Internal oil gallery pressure measures 54 PSI with oil sump temp remaining at 191°F under full brake load. Exhaust gas temp tops at 1280°F down the test header tubes. Cylinder compression reads between 170 PSI and 178 PSI across all eight cylinders. Crankshaft center journal runout holds within 0.0003in TIR.

Field Installation Limitations Rules

Carburetor throttle linkage return mechanisms require 5 lbs of pull force to guarantee positive throttle butterfly closing at idle. This classic crate engine is not engineered for computer-controlled fuel injection swaps, closed marine hulls, or high-vibration sawmill power skids.

• Drain initial break-in petroleum zinc oil after 500 miles or 25 operating hours.
• Set hydraulic lifter preload to one half turn past zero lash on base circle.
• Torque cylinder head bolts in three stages to 65 ft-lbs final specification.

Commercial Protection Crate Manifest

Backed by the Chevrolet Performance assembly standard, this crate engine carries a 3-Year 100,000-mile parts protection warranty. Every sealed wooden crate holds the complete long block engine, oil pan, front timing cover, valve covers, oil pump pickup screen, and signed dyno run documentation.