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New! forged internals and 6-bolt LSX heads that support more boost! For builders who want to stretch the performance of a turbocharged or supercharged combination, we’ve got just the foundation you need: Chevrolet Performance’s new LSX376-B15, featuring a durable, allforged rotating assembly to handle up to 15 pounds of boost.

Chevrolet Performance’s engineers started with the tough LS steel Bowtie standard-deck block, added a forged steel crankshaft, forged rods and forged pistons, then topped off the short-block assembly with high-flow, rectangular-port LSX- LS3 6-bolt aluminum heads for supercharged and turbocharged combinations.

We deliver the LSX376-B15 without an intake manifold and other accessories, allowing you to tailor the induction system and other features to suit the forced-induction setup of your choice. It’s perfect as an economical replacement for a late-model performer or a great choice to build a high-boost power plant for a Pro Touring classic.

*Horsepower and torque ratings were derived by GM Engineering using a normally aspirated LSX376 with LS3 EFI. Your power numbers may vary, based on induction system and componentry.

LSX376-B15 TECH SPECS Part Number: 19355575

Engine Type: LSX-Series Gen IV Small-Block V-8 Displacement (cu. in.): 376 (6.2L) Bore x Stroke (in.): 4.065 x 3.622 (103.25 x 92 mm) Block (P/N 19260095): LSX cast-iron with six-bolt, cross-bolted main caps Crankshaft (P/N 12603616): Forged steel Connecting Rods (P/N 12607475): Forged powdered metal Pistons (P/N 19259381): Forged aluminum Camshaft Type (P/N 12638426): Hydraulic roller Valve Lift (in.): 0.560 intake / 0.555 exhaust Camshaft Duration (@0.050 in.): 210° intake / 230° exhaust Cylinder Heads (P/N 19201805): LSX-LS3 rectangular port; with “as cast” 68-cc chambers/six-bolt attachment Valve Size (in.): 2.160 intake / 1.550 exhaust Compression Ratio: 9:1 Rocker Arms (P/N 12569167 int): Investment-cast, roll trunnion Rocker Arms (P/N 10214664 exh): Investment-cast, roll trunnion Rocker Arm Ratio: 1.7:1 Recommended Fuel: 87 octane Maximum Recommended rpm: 6600 Reluctor Wheel: 58X Balanced: Internal

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GM Performance LSX376-B15 19355575

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  • $9,999.99

  • Shipping: $199.95