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MSRP

$9,875

Part No.

19299306

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For Off-Road &

For Off-Road &
STREET

6 Select
Available Mods

Power

Power
450
hp @ 5900 rpm

Forged internals and six-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, all-forged 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 six-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 powerplant 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 DYNO

Click on the slider to see the torque and power ratings change with rpm.*

*Approximate values shown.

LSX376-B15 TECH SPECS

Part Number:
19299306
 
 
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

OWNER RESOURCES

Already own one, but lost some of the paperwork? We’ve got you covered with downloads and links for some of the more important documents below. You’ll find everything from the vital data about your engine’s capabilities to how to install it into your build, even all of the warranty information should you need to make a claim. And don’t forget, the best way we can make sure to get you the latest information on your specific part is to tell us which one you have by registering your engine. No matter what stage of your build you’re in — from shopping for the right part to that part having turned in a few miles — we have the information you need.

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  • INSTALLATION NOTES

    • Assembly does not include any electronics
    • Intended for pre-1976 street vehicles or any off-road vehicle
    • Not intended for marine applications
    • Requires LSX Ignition Controller (P/N 19171130) for carbureted applications
    • LSX eight-bolt crank flange
    • Assembly shipped without intake manifold or oil pan (dust shield installed for shipment)
    • Recommended max boost — 15 PSI

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FINISH OFF YOUR CRATE ENGINE WITH THESE SELECT PARTS

Download a catalog for a full listing of components and related parts.

SuperMatic 4L70-E Four-Speed Automatic
Transmission • P/N 19244043

ZL1 Supercharger • P/N 19300534

Transmission Controller • P/N 19212657

LSA Intercooler Fluid Pump • P/N 22901367

LSX-LS3 Single-Plane Standard Deck 4-bbl Manifold
• P/N 19244035

Camaro ZL1 Fuel Pump Module • P/N 19260557

  • 1 Performance MSRP The Manufacturer's Suggested Retail Price excludes tax, shipping and installation.