Atomic Ford DOHC (Barra) Heavy Duty Timing Chain Kit

Whether you're refreshing a factory engine or building a 1500hp monster, the Atomic Heavy Duty Timing Chain Kit has everything you need to confidently replace the entire timing system on any Ford Barra DOHC 6-cylinder engine.

This is not just a chain and tensioner kit — it’s a fully engineered solution built for serious performance. Featuring a heavy-duty chain, a hardened billet curved guide, new billet hardened steel crank sprocket, genuine Ford tensioner, and all required guides, bolts, gaskets, and seals, this kit is trusted in both street and full race applications.

We’ve refined every component to survive extreme RPM, big cams, stiff valve springs, and heavy-duty use — with detailed installation instructions included to make your timing system upgrade precise and stress-free.

✅ Suits all Ford Barra DOHC 4.0L 6-cylinder engines (BA–FGX)
✅ Built for everything from stock rebuilds to 1500hp performance builds
✅ Includes Atomic Heavy Duty Timing Chain – ~2x strength vs factory
✅ Billet steel curved guide – heat treated, unbreakable, and tip reprofiled to prevent plastic failure
✅ Billet crank sprocket – case-hardened, heat treated, and tighter tolerance for reduced vibration
✅ Billet chromoly pivot bolt for added durability
✅ New top guide and straight guide
✅ Genuine Ford OEM hydraulic chain tensioner
✅ All necessary seals and gaskets included
✅ Full installation instructions included for DIY or pro use

#306620-K-C (with Tensioner AND crank sprocket)

Comprises H/D timing chain, OEM FORD tensioner, guides x 3 (including billet driver's side guide), billet crank sprocket & CRMO timing pivot bolt. Gaskets/seals for 5/2005 on.

#306620-K-T (with Tensioner but no crank sprocket)

Comprises H/D timing chain, OEM FORD tensioner, guides x 3 (including billet driver's side guide) & CRMO timing pivot bolt. Gaskets/seals for 5/2005 on.

#306620-K-S (NO tensioner but with billet sprocket)

Comprises H/D timing chain, guides x 3 (including billet driver's side guide), billet crank sprocket and CRMO timing pivot bolt. Gaskets and seals included for >5/2005 engines.

#306620-K-P (Partial kit, NO tensioner OR billet sprocket)

Comprises H/D timing chain, guides x 3 including billet drivers side guide and chrome moly timing pivot bolt. No tensioner, sprocket or gaskets/seals included.

✔️ Replaces every critical timing component in one complete package
✔️ Designed to prevent common Barra timing failures (chain stretch, guide breakage, sprocket wear)
✔️ Billet and heat-treated components ensure long-term reliability under power
✔️ Precision fitment and proven durability in street, dyno, and strip builds
✔️ The same billet guide design everyone else copied — we just perfected it