Improved Runners & Chambers Yield Higher Flow & Swirl Rates

Sold individually, these aluminum bare cylinder head castings are designed to be direct bolt-ons for 2001-15 Duramax 6.6L diesel trucks. Simply install heads using the existing valvetrain to gain up to 100 horsepower! "Moved Centerline" cylinder heads allow the use of a larger valve combination for even more flow on stock engines (piston valve pockets may require flycutting for clearance).