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.
Click on the slider to see the torque and power ratings change with rpm.*
*Approximate values shown.
LSX376-B15 TECH SPECS
LSX-Series Gen IV Small-Block V-8
Displacement (cu. in.):
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):
Connecting Rods (P/N 12607475):
Forged powdered metal
Pistons (P/N 19259381):
Camshaft Type (P/N 12638426):
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
Rocker Arms (P/N 12569167 int):
Investment-cast, roll trunnion
Rocker Arms (P/N 10214664 exh):
Investment-cast, roll trunnion
Rocker Arm Ratio:
Maximum Recommended rpm:
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.
***The Manufacturer's Suggested Retail Price excludes tax, title, license, dealer fees and optional equipment. Includes destination freight charge and gas guzzler tax.
Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance Parts may not meet Federal Motor Vehicle Safety Standards and emissions regulations and should not be operated on public roads. Chevrolet Performance customers are responsible for ensuring their use of Chevrolet Performance complies with applicable federal, state, and local laws, regulations, and ordinances. Many parts intended for racing or other “off-highway” use are not designed or tested for crashworthiness or to meet the safety needs of the motoring public, and may adversely affect the original intended performance or handling characteristics of the vehicle. These parts are designed and intended to be used with experts supervising their installation and use, to help assure the proper and safe operation of the vehicle.
To allow you to do an accurate price comparison with prices featured on other Internet sites, GM provides Internet pricing both with and without the Destination Freight Charge (see prices including Destination Freight Charge below). To get full pricing details, go to our Build Your Own section.