A Cummins engine's internal airflow—and methods of improving it—was the main topic of our recent discussion with Zach Hamilton, maker of the only high-performance, 12-valve cylinder head available for Cummins powerplants.
We recently caught up with Craig Johnson of Big Power Diesel in Palmdale, California, and followed along as he performed a few of these budget-minded upgrades (and some basic repairs) on a 1992 Dodge truck.
We constantly preach that lifting your truck on bigger wheels and tires kills performance and mpg. The quickest and easiest way to reclaim some of that lost power is to upgrade the intake and exhaust systems.
With show season in full swing, we wanted to give you a basic look at how some well-placed billet engine dress-up parts can help you take some trophies home at events—and take more pride in your truck.
After a few runs and tweaks to the tune, it ended up making 551 hp at 6,200 rpm and 520 lb-ft of torque at 4,600 rpm. That’s more than enough power to light up the tires at the dragstrip or hustle around an autocross course.