If you purchased a 1996-or-later Chevy or GMC C/K series pickup that’s motivated by a 7.4L Vortec V-8--the contemporary handle used to describe a 454ci Rat motor equipped with GM’s Vortec package--chances are it’s either some type of dualie, a special-order 3/4- to 1-ton pickup, or a Suburban. And it’s likely that you ordered your truck with a big arm under the hood, since its low-range torque output helps when you’re towing and hauling.

Whipple Industries offers many Whipplecharger screw compressor kits for all C/K-series pickups powered by either 4.3L, 5.0L, 5.7L, or 7.4L engines. The installation we observed was a kit for 7.4L V-8 Vortec engines, which was put on a new 1998 Chevy Extended Cab dualie with an automatic transmission and a set of Mesa headers and exhaust. Though we didn’t get a chance to dyno- test this unit, we can attest that it didn&8217t negatively affect the mileage under any driving condition; the mileage was equivalent to the stock figures. Performance did, however, improve dramatically--especially when towing. And yes, it did boil the dualie hides. Really.

But if you want numbers, check out the ratings on the accompanying chart for this kit based on a stock truck that was tested by Whipple Industries on a Dynojet dynamometer.

As the numbers show, this unit gets it on and with hard kick (as evidenced by the high torque peak in the low-rpm range). The suggested retail price for this kit runs around $3,850 (hey, whoever said power was cheap?).

Read along as we install the unit, and notice how factory it looks once it's installed.

SOURCE
Mesa Headers
711 W. 17th St., Ste. A-9
Costa Mesa
CA
Whipple Industries Inc.
3292-1/2 N. Weber
Fresno
CA