Gwatney Performance Innovation can perform nearly every performance modification imaginable to a wide variety of vehicles. Custom ground camshafts and cylinder heads have become a mainstay at GPI – especially for the LTx and LSx motor platforms.

We specialize in supercharged, turbocharged and nitrous projects – and bring the total package together with a custom tune using our own in-house dyno.

Contact Us

Have a Question?

(501) 985-4947


Customer Service Hours

Monday – Friday

7:30AM – 5:30PM

Mailing Address

1301 T P White Dr

Jacksonville, AR 72076

GPI Team

Aaron Salisbury
Director of Operations

Ryan Stevens
R&D Lead / head calibrator

James Zajac
Sales consultant

Ronnie esmon
sales / business development

Josh Yielding
sales / shipping & receiving

John Sims
Engine Builder / technician

Mike Pestka
Fabrication / technician

Juan Sanchez

John Barnes

Ben Weishaar
Calibration Specialist