The new Katech 416 is designed to be the foundation for 600 horsepower or more in normally aspirated setups 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.
Starting with the proven LS3 aluminum block Katech uses the stock bore size and a longer stroke to achieve 416 cubic inches. A high-performance Callies forged-steel crank with a 4.00-inch-stroke crankshaft is installed in place of the factory-spec 3.62. 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.
“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.
Learn more on Katech 416, Katech’s new video channel: www.thekatechnetwork.com.