LS Classic Series LS Classic GMLS9012 LS3 Tri-Power Crate Engine, Chrome BBC Style

GMLS9012 swaps the single-intake look for a Tri-Power style setup on top of the same GM LS3 long block used across this line, 376 cubic inches good for 495 HP and 473 lb-ft, finished with chrome Big Block Chevy-style covers over a painted-orange block and a two-year warranty. Tri-Power details A triangular chrome air cleaner replaces the round style seen on other chrome LS Classic builds here, and the valley plate underneath carries a breather rather than an oil fill tube. Wiring and tuning come from a Holley Terminator EFI computer, with cooling handled by a thermostat housing, balancer, and water pump built to Corvette spec; exhaust routes through high-performance rear-dump manifolds, and automatic-transmission builders get a 14-inch flexplate. Compression and valve numbers Compression sits at 10.7:1, with aluminum heads running 2.165-inch intake and 1.590-inch exhaust valves through a 1.7:1 rocker ratio. The hydraulic roller cam is specced for .525-inch lift front and back, 219 degrees of intake duration and 228 of exhaust, and Chevrolet Performance's RPM ceiling is 6,600. What to add yourself As with the rest of this line, a starter, front accessory drive, and coil mounting hardware are left to the installer, since these valve covers carry no coil-mounting points of their own. Common questions What makes Tri-Power different from the standard Classic version? It swaps the single intake for a Tri-Power setup and uses a triangular air cleaner and breather-equipped valley plate. What's the warranty? Two years, from GM and LS Classic. Specifications KEY SPECS MFG. Part # GMLS9012 Brand LS Classic Crate Engine Type Long Block Engine Displacement 376 cu. in. Horsepower 495 horsepower Compression Ratio 10.7:1 Torque 473 ft./lbs. Camshaft Type Hydraulic Roller Tappet Cylinder Head Material Aluminum Piston Material Hypereutectic Aluminum Crankshaft Material Nodular Iron Combustion Chamber Volume 68cc Camshaft Duration (.050 in) 219° intake / 228° exhaust Camshaft Lift (in) .525 intake /.525 exhaust Bore x Stroke (in) 4.065 x 3.622 (103.25 x 92mm) Carburetor Included No Intake Manifold Included Yes Distributor Included No Connecting Rod Material Powdered Metal Valve Covers Included Yes Engine Balance Internal Cylinder Heads Included Yes Rear Main Seal Style 1-piece Throttle Body Included Yes Oil Pan Included Yes Timing Cover Included Yes Water Pump Included Yes Harmonic Balancer Included Yes Flexplate Included Yes Flywheel Included No Air Cleaner Included Yes Spark Plugs Included Yes Spark Plug Wires Included No Computer Included Yes Wiring Harness Included Yes Accessory Bolt Holes Drilled Yes Recommended Fuel Premium GENERAL Maximum RPM 6600 Assembled Yes Cylinder Head Style Assembled Intake Valves Included Yes Intake Valve Diameter 2.165″ Exhaust Valves Included Yes Exhaust Valve Diameter 1.59″ Valve Spring Included Yes Rocker Arm Studs Included Yes Rocker Arms Included Yes Heat Crossover Yes Head Gaskets Included Yes Intake Style Electronic Fuel Injection Intake Finish Natural Intake Material Aluminum Intake Gaskets Included Yes Intake Manifold Fasteners Included Yes Camshaft Included Yes Intake Duration (.050″ Lift) 219° Exhaust Duration (.050″ Lift) 228° Lifters Included Yes Cylinder Heads Aluminum L92-style port; “as cast” with 68-cc chambers Valve Size (in) 2.165 intake / 1.590 exhaust Rocker Arms Investment-cast, roller trunnion Rocker Arm Ratio 1.7:1 Maximum Recommended RPM 6600 Reluctor Wheel 58x Internally Balanced Yes Displacement 376 (6.2L) Block Cast-aluminum with six-bolt, cross-bolted main caps Pistons Hypereutectic Aluminum GTIN Code 847087045360 Notes Engine does not include starter or front engine accessory drive. Engine harness requires installation. Valve covers do not have provisions for mounting ignition coils, remote mounting is required. Includes chrome BBC style valve covers and triangular chrome air cleaner. Engine is painted orange. Sold in Quantity Each