Studs

iesel Head Stud Kits for Powerstroke, Cummins & Duramax
Factory head bolts on most diesel engines are torque-to-yield fasteners — they stretch during installation and are not designed to be reused or to hold up under sustained elevated cylinder pressure. When a diesel truck is towed hard, tuned aggressively, or pushed into high-boost territory, those stock bolts can allow the head to lift off the block under peak pressure. That’s when the head gasket fails, coolant enters the combustion chamber, and the repair bill gets serious.

Studs replace the head bolts entirely with a reusable, high-tensile fastener that threads into the block and clamps the head with a nut. The clamping load is higher, more even, and doesn’t change the way a stretch bolt does. On hard-use builds, studs are part of doing the job correctly the first time.

What to know before you order
Replace when you have the head off. If the engine is apart for a head gasket repair, there’s no good reason to reinstall stock torque-to-yield head bolts. The labor is already done — the stud kit is cheap insurance against doing it again.

240ksi vs. standard tensile strength. Our 240ksi stud kits are engineered for high-boost performance builds, compound turbo setups, and engines running well above stock power levels. Standard tensile studs handle street, tow, and moderate performance applications reliably. Match the hardware to the build.

Platform fitment matters. We stock stud kits for Powerstroke 6.0L and 6.7L; Cummins 5.9L 12-valve (12mm), 24-valve (12mm and 14mm), and 6.7L; and Duramax 6.6L. Confirm your platform and engine year before ordering.

For combination builds, see our Studs & Gaskets Combos — matched stud and gasket sets built for specific platforms so you get the right pairing in one order.