You are currently viewing the Canada version of the site.
Would you like to switch to your local site?


Just like any short-block build, your cylinder head is only as good as the machine shop that put it together. Proper inspection, precision machining via state-of-the-art equipment, a good valve job, and the company’s track-record in the industry all factor into the deal—especially if you’re chasing four-digit horsepower. For ’03-present Cummins owners looking to go big, there is a lot more to it than simply adding head studs. The factory, crack-prone valve seats need to be addressed before they become a major problem, stiffer valve springs need to be added to handle elevated rpm, drive pressure, and boost, and fire rings are requisite for utmost combustion sealing.

Based on the head work it was regularly performing for its truck pull and drag race customers, the folks at Freedom Racing Engines—the engine building wing of Fleece Performance Engineering—decided to offer a competitionready cylinder head for 24-valve Cummins owners. Called its Performance head, each reconditioned unit comes loaded with some of the best components available in the aftermarket, along with its factory weak links addressed.

Read the complete article and many more in this issue of Diesel World
Purchase options below
If you own the issue, Login to read the full article now.
Single Digital Issue Oct 2019
$8.49 / issue
This issue and other back issues are not included in a new subscription. Subscriptions include the latest regular issue and new issues released during your subscription. Diesel World
Annual Digital Subscription Plus the last 6 back issues for free Now $27.99 billed annually