This Chevrolet Performance 19435104 LS376/525 Crate Engine includes the aggressive ASA performance cam. The camshaft has a tight lobe separation of 110 degrees and .525 inches of lift on both the intake and exhaust, 226 degrees duration on the intake, and 236 degrees duration on the exhaust measured at 0.050 inch, which produces superior throttle response, great top-end power, and a lumpy idle.

Chevrolet Performance 19435104 LS376/525 Crate Engine Specs:

• Engine Type: LS-Series Gen IV Small-Block V-8
• Displacement: 376 ci (6.2L)
• Bore x Stroke: 4.065 in. x 3.622 in. (103.25 x 92 mm)
• Block: Cast aluminum with six-bolt, cross-bolted main caps
• Crankshaft: Nodular iron
• Connecting Rods: Powdered metal
• Pistons: Hypereutectic aluminum
• Camshaft Type: Hydraulic roller
• Valve Lift: .525 in. intake/.525 in. exhaust
• Camshaft Duration @.050 in: 226° intake36° exhaust
• Cylinder Heads: Aluminum L92-style port; "as cast" with 68cc chambers
• Valve Size: 2.165 in. intake/1.590 in. exhaust
• Compression Ratio: 10.7:1
• Rocker Arms: Investment-cast, roller trunnion
• Rocker Arm Ratio: 1.7:1
• Recommended Fuel: Premium pump (92-octane)
• Maximum Recommended rpm: 6600
• Reluctor Wheel: 58X
• Balance: Internal

Chevrolet Performance 19435104 LS376/525 Crate Engine Notes:

• Supersedes 19435104, 19434642, 19432418, 19369338,19301360, 19370413
• Does NOT include the ECM controller kit
  • Requires Chevrolet Performance 19354332 Engine Controller Kit or equivalent (sold separately)
• Does NOT include exhaust manifolds or flexplate/flywheel
• Requires Premium 93-Octane Fuel
• Uses the Chevrolet SS Oil Pan Assembly
  • Will require Muscle Car Oil Pan Kit 19212593 or equivalent (sold separately) for installation in older vehicles
• Not Intended for Marine Usage
• Developed by GM for Pre-1976 Street Vehicle Engine Swaps

Use only engine oil that meets dexos1 specifications. For track events or competitive driving, use Mobil 1 15W-50 engine oil. Fill the engine with oil and follow the proper engine priming procedure.  Also check and fill as required any other necessary fluids such as coolant, power steering fluid, etc.

Start the engine and listen for any unusual noises. If no unusual noises are noted, run the engine at approximately 1000 RPM until normal operating temperature is reached.  The engine should be driven at varying loads and conditions for the first 30 miles or one hour without wide open throttle (WOT) or sustained high RPM accelerations.  Run five or six medium throttle (50%) accelerations to about 4000 RPM and back to idle (0% throttle) in gear. Run two or three hard throttle (WOT 100%) accelerations to about 4000 RPM and back to idle (0% throttle) in gear. 

Change the engine oil and filter. Inspect the oil and the oil filter for any foreign particles to ensure that the engine is functioning properly.  Drive the next 500 miles (12 to 15 engine hours) under normal conditions. Do not run the engine at its maximum rated engine speed. Also, do not expose the engine to extended periods of high load.  Change the oil and filter again, inspect the oil and oil filter for any foreign particles to ensure that the engine is functioning properly.

19435104 supersedes 19434642, 19432418, 19419866, 19370413

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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