Tameless performance

10/21/2026

Performance is always in mind (along with how sick it looks) when we're making our billet products.

This is our Billet Rocker Box for the 5.9L / 6.7L Cummins (2006+)
The Factory Rocker box weight is 5.95lbs our Billet Cummins Rocker box is 4.8lbs complete big plus for Diesel race engines. While providing Improved clamping for sealing.

Visit our website or give the shop a call to place an order.

10/20/2026

Designed to replace the factory cast aluminum rocker box found on 2006+ Cummins 5.9L and 6.7L engines.

Machined from premium 6061-T6 billet aluminum, this rocker box offers improved rigidity, superior sealing, and a clean, high-end appearance that stands out under the hood. The Factory Rocker box weight is 5.95lbs our Billet Cummins Rocker box is 4.8lbs complete big plus for Diesel race engines. While providing Improved clamping for sealing.

The rocker box is available on our website.
TAMELESSPERFORMANCE.COM

10/19/2026

This is your sign to get a custom engraved billet valve cover for your 5.9L / 6.7L Cummins.

DM or give the shop a call to place a custom order.

10/16/2026

Custom billet valve cover we did for a buddy of ours. Let us know what you would want to get on your custom billet valve cover.

10/15/2026

This is your sign to get a custom billet valve cover for your 5.9L / 6.7L Cummins.

DM or call us at the shop to get an order placed.

10/14/2026

2ND GEN vs 3RD GEN FOR $100,000 SEVENTY2FAST Firepunk Diesel Lavon D. Miller

10/14/2026

10/14/2026

🔦 VENDOR SPOTLIGHT 🔦

Shoutout to for bringing the heat to UCC! 🔥 From their parts display to the gear wall, their booth was a must-stop for anyone walking the pits.

Check them out at tamelessperformance.com and show them some love in the comments 👇

Want your business in front of the UCC crowd? DM us about vending at UCC 2027! 📩

🎟️ Tickets on sale now for June 4–6, 2027
🔗 ultimatecalloutchallenge.com

10/13/2026

We've all have seen our Cummins Billet Valve Covers, but we haven't shown you how we machine them.

If your 5.9 / 6.7L Cummins still doesn't have one of our billet valve covers, visit our website or give the shop a call.