Katech Performance is known for its work in the automotive industry. Chances are you’ve heard the name that’s partly responsible for the success of Corvette Racing; along with super Aston Martins and Dodge Vipers. LSXTV shows us that Katech is continuing to do great things, particularly with the newer 6.2-liter LT1 V8 engine. Jason Harding, director of aftermarket operations at Katech, says that when combined with the Grand Sport package this engine will essentially provide the customer with a naturally aspirated C7 Z06.
Katech took the factory LT1 and put in a 4-inch stroke with a Callies forged 4340 steel crankshaft, which raised the total displacement to 427 cubic inches. Katech also threw in forged h-beam connecting rods, and Diamond forged 2618-alloy slugs. The top-end is comprised of Katech CNC-ported heads, featuring high-lift valve springs and titanium valve spring retainers. With all of that the compression rose to 12:5:1.
An MSD Atomic Air Force intake manifold replaced the factory manifold and is fitted with a 103mm billet throttle body. The direct-port fuel injectors were modified to handle the extra fueling, and the stock injection pump is still able to get the job done.
All of these modifications translate into 700 horsepower and 620 lb-ft of torque, which is 50 more than the supercharged Z06. All of that power without the assistance of forced induction, now that’s impressive.
“Not only does the Street Attack 427 make 700 horse, it makes at least 600 lb-ft of torque from 4,400-5,700 rpm,” Harding said. “In fact, it made at least 500 lb-ft of torque everywhere we tested it.” Harding also states that the cam provides great vacuum and drivability, keeping with the engine’s nomenclature – Street Attack Ls7.
If you’re like us you probably want to know how you might get your hands on one of these. LSXTV reports that Katech will install this motor in your C7 Corvette at their location in Clinton Township, Michigan. You can also order it as a crate motor, which will cost you *ahem* $28,393. On the surface that may sound expensive, but you know what they say, you’ve got to pay to play (or be able to build it yourself). And Katech is one of the best engine builders in the business.
Such an engine has us fantasizing. With the GM Alpha platform being compatible with the LT1 powerplant, how viable would it be to build a rather basic ATS or Camaro into a 427 ci V8-powered CTS-V/Z06 killer? And would it be possible to build it for less than the price of said CTS-V/Z06? Let us know if this idea entices you, or if you think it’s a pipe dream build that requires more work than one might expect.