The system inco Much of the IROC Camaro's newfound agility comes from Chevrolet's Tuned Port Injection system, which was first used on the 5.7L Corvette engine. Hot Rod ...

I knew a hot rodder was going to figure this out sooner or later. Ever since Chevrolet introduced their slick-looking, state-of-the-art, efficient Tuned Port Injection, we have been searching for ...

The Tuned Port Injection system first appeared on ´85 Corvettes. With fuel economy increases in the 11 percent range, a bump in horsepower to 230, and torque jumping from 290 to 330, ...

Available as an option package for the Z28, the IROC-Z was originally offered with a 305ci (5.0-liter) engine, while a 350ci (5.7-liter) joined the lineup in 1987.