What are the opening hours?

Monday 8:30am - 5pm Tuesday 8:30am - 5pm Wednesday 8:30am - 5pm Thursday 8:30am - 5pm Friday 8am - 4pm

Tru Cylinder Head and Machine

Name: Tru Cylinder Head and Machine
Address: Knoxville, TN, US
Telephone: (865) 548-8520

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Knoxville, TN
Tru Cylinder Head and Machine

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Located at 123 Mount Horeb Rd, Jefferson City, TN, we are a full service engine machine shop specializing in automotive and light duty Diesel engines.

We can handle anything from small cylinder head repairs to complete engine overhauls.

10/30/2026

6.4 owners, this one’s for you🙌🏼

This Powerstroke short block the full Stage 1 treatment: screw-in oil plugs, a Stage 1 cam, coated pistons, Mahle performance rod and main bearings, and our full machine work service.

This is what we do at Tru.

10/27/2026

Bored .020 over and honed to perfection.👏🏻

This 6.4 Powerstroke block goes through 3-4 honing grits depending on the application. That’s what gets the right crosshatch and finish for oil control and ring seal.

No shortcuts here at Tru.

10/26/2026

The foundation of a strong 5.9 starts up top.🔧

Screw-in freeze plugs. New guides and hardened seats are all done and ready for the next build.

10/23/2026

Turning up the power on your 6.7? Your head needs to keep up.👀

This one got O-ringed for better sealing under boost, stage 1 valve springs, screw-in freeze plugs so they won’t pop out, and our full machine work service.

10/22/2026

Behind every strong diesel is a solid foundation.🙌🏼

This short block is coming together piece by piece, built right from the bottom up.

10/20/2026

Fresh set of 7.3 Powerstroke heads ready to go.

✔️Valve job
✔️Pressure tested
✔️All new exhaust valve guides
✔️Upgraded Comp 910 valve springs

Built right and ready to run. Message us or call (865) 548-8520 to get yours done.

10/19/2026

Half of one thousandth of an inch👏🏻 That’s the finish pass we’re putting on this John Deere 4440 7.6L head.

Little details make a big difference.

Call (865) 548-8520

10/16/2026

Six cylinders, twelve valves, zero shortcuts👏🏻

Fresh build and a clean black finish on this inline-six long block.

10/14/2026

Mercedes Diesel 7.2L OM926 head, pressure tested, valve job, and resurfaced.

Built right, built to last🔧

📍123 Mount Horeb Rd, Jefferson City, TN 37760

10/12/2026

POV: walking past the build cart on a Monday 👀

Block on the stand, timing gears showing, and parts bagged up waiting their turn.

Another one coming together in the shop 🔧

Address

Knoxville, TN

Opening Hours

Monday	8:30am - 5pm
Tuesday	8:30am - 5pm
Wednesday	8:30am - 5pm
Thursday	8:30am - 5pm
Friday	8am - 4pm

Telephone

(865) 548-8520

Website

https://www.powerhouse-diesel.com/pages/machine-shop

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