Katech's LS3-Based 416 Short Block - Engine Builder Magazine

Katech’s LS3-Based 416 Short Block

Katech has introduced a new LS3-based 416-cubic-inch short block designed to make big power for less. Depending on the camshaft, cylinder heads and other engine components, the new Katech 416 is the foundation for 600 horsepower or more in normally aspirated combinations and up to 900 horsepower or more in boosted applications.

Katech has introduced a new LS3-based 416-cubic-inch short block designed to make big power for less. Depending on the camshaft, cylinder heads and other engine components, the new Katech 416 is the foundation for 600 horsepower or more in normally aspirated combinations and up to 900 horsepower or more in boosted applications.


“The new Katech 416 short block is a big-power foundation that won’t break the bank,” said Jason Harding, director of aftermarket operations at Katech. “Shop around, and you’ll find our 416 LS3 short block is priced at or below competitors’ products while using top-shelf components and, of course, the meticulous precision blueprinting and assembly that 40 years of engine building experience brings.”

Starting with the proven LS3 aluminum block, which is honed by Katech to 4.070 inches and clearanced for a stroker crankshaft, a high-performance Callies forged steel crank with a 4.00-inch-stroke crankshaft is installed in place of the factory-spec 3.62-inch crankshaft. That expands displacement 40 cubic inches to 416 – a nearly 11-percent increase over the stock 376 cubic inches.

The rest of the short-block assembly is filled with high-performance forged components, including Mahle pistons, rings and wrist pins, and 6.125-inch Callies H-beam connecting rods. With heads featuring the stock LS3 combustion chamber volume, the compression ratio is 10.9:1. The short block is assembled with Clevite bearings and all oil/coolant plugs installed.

The Katech 416 short block lists for $5,899.99. A camshaft and other engine components required to build a complete engine are available from Katech, as well as engine building, tuning and testing.

“Whether you want the short block as a starting point to build your own high-performance stroker LS3 or have Katech build an entire engine around it, it’s a great, economical foundation to build big horsepower,” said Harding. “And when it comes to having your engine built at Katech, it will be assembled by the same experienced builders responsible for assembling Le Mans-winning racing engines.”

You May Also Like

Women with Drive Event Planned for 2024 Pikes Peak

Women with Drive event will feature a panel discussion and reception at the U.S. Olympic and Paralympic Museum in Colorado Springs on June 21.

Women in Motorsports North America (WIMNA) and Parity, the sports marketing and sponsorship platform dedicated to closing the gender income and opportunity gap in professional sports, have announced the latest edition of their collaborative event series Women with Drive: Pikes Peak, presented by RBC Wealth Management. The event will celebrate that for the first time in history, the PPIHC will feature six women drivers: Mary Barker, Ryan Cheek, Laura Hayes, Katherine Legge, Kathryn Mead, and Loni Unser. 

Virginia Disassociates from California Emissions Standards and ICE Ban

Elected in 2021, Youngkin campaigned on repealing California’s standards and pledged to follow through during his 2023 State of the Commonwealth address.

Babcox Media Appoints Tom Pecka Director of Strategic Partnerships

Pecka will oversee the development and execution of strategic media partnerships and sponsorships, as well as enhance media activations across the company’s media channels.

Mazak Celebrates 50 Years of Manufacturing in Kentucky

Mazak technology, service and support has helped manufacturers overcome their toughest challenges for the past 50 years and will continue to do so well into the future.

SEMA Battle of the Builders Enters Second Decade of Competition

Now in its 11th year, SEMA Battle of the Builders is a vehicle competition providing an international platform for SEMA Show builders to showcase their ingenuity.

Other Posts

Pat Symonds Joins Andretti’s Formula 1 Effort

Symonds most recently served as chief technical officer for Formula 1 and will officially join Andretti Cadillac at its new Silverstone, England operations.

NTPA’s Hot Shot’s Secret Challenge is Back for a Second Season

The NTPA’s Hot Shot’s Secret Challenge gives competitors a chance at over $30,000 in payout to the top three-point earners per division.

Sunnen Earns President’s E Star Award for Third Time

Sunnen was one of 13 entities to receive the E Star Award for a significant contribution to the expansion of U.S. exports.

Charlotte Motor Speedway Names Greg Walter President

Walter oversees daily operations of the facility, which includes the 1.5-mile superspeedway, the zMAX Dragway, and The Dirt Track at Charlotte.