Turn Key Engines is expanding its retro-fit line to serve select late-model applications, starting with a 430-horsepower LS engine swap into the JK series of Jeep Wranglers.

Although the JK Wranglers, which started production in 2007 and continue today, have some of the most advanced off-roading and comfort features ever offered in the popular utility vehicle — they’re down on power.

“It’s miserable with 200 horsepower. We can double the power easily,” says Kolby Enger of Turn Key, which is based in Oceanside, California. “And it’s 50-state legal.”

The 6.2-liter engine is mated to a 6L80E 6-speed automatic transmission.

“We integrate the GM engine ECU into the Jeep system, and there’s a stand-alone controller for the transmission,” says Enger.

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Turn Key offers a variety of LS-based engines, complete with accessories, headers and installation hardware.

Turn Key has numerous retro-fit packages to install LS engines into ’55-’57 Chevys, 1st- and 2nd-generation F-bodies, ’64-’72 Chevelles and other A-bodies, most pickup trucks and the ’83-’88 G-body. Besides an LS engine built to the customer’s specifications, the kit includes custom oil pan, mounts, headers specific to the vehicle and a radiator.

Standard features on the LS engines include full ignition system with coil packs and plugs, a Delphi ECU with Turn Key’s calibrations, marine-grade wiring harness, serpentine belt system, fuel pump and regulator, alternator, water pump and all the necessary brackets. Customers can also get a detail package with filters, hardware, temp and pressure sending units, flywheel or flex plate, Corvette covers and the installation guide.

In addition to the LS engines, Turn Key offers 2.2- and 2.4-liter Ecotec 4-cylinder engines and select Ford models. And the company can develop race packages.

“We can go from 350 to 1,200 horsepower,” sums up Enger.