Cummins 12-Valve Clear Valve Cover Set (6BT & 4BT)
Cummins 12-Valve Clear Valve Cover Set (6BT & 4BT)

Cummins 12-Valve Clear Valve Cover Set (6BT & 4BT)

$329.00
$329.00
Sold Out

Engine : 4BT (set of 4 covers)

Built for mechanical honesty. These Ghost Covers bring clear visibility to the legendary Cummins 12-valve platform without compromising durability. Formed from .187" thick high-clarity polycarbonate and finished with our high-temperature oleophobic ceramic coating inside and out, they let you see your valvetrain and oiling system in real time, while standing up to heat, oil, and long-term use.

No chrome. No gimmicks.
Just a clear view of what’s happening under the hood.

Fits both industrial and automotive 12-valve applications using standard valve cover geometry.

What’s In The Box?

One full set of .187" thick oleophobic ceramic-coated polycarbonate valve covers. (Four or Six, depending on your platform.)

Installation bolts with sealing washers

12" x 12" microfiber towel

Installation and care instructions

Care Guide


DO:

Use a soft microfiber cloth (included)

Clean with water + mild dish soap

Blow off dust with clean compressed air before wiping (if available)

DO NOT:

Use harsh solvents (acetone, brake cleaner, alcohol)
(Polycarbonate can tolerate them, but the ceramic coating cannot)

Use glass cleaners containing ammonia

Pressure wash up close or use hot degreasers

Scrub with paper towels or abrasives

The coating is oil- and UV-resistant, but it is not indestructible.

12-Month Warranty

Covers manufacturing defects for one full year from purchase date.


*Heat control is important. Our clear valve covers are designed to withstand upwards of 300°F, but upswept headers, turbo housings, and turbo plumbing must be properly insulated using heat blankets or exhaust wrap to prevent radiant heat damage to the polycarbonate.

Legacy Form USA is not responsible for damage caused by external radiant heat sources.

Typically ships within 7–10 days.

Ghost Cover FAQ

A: We currently offer Ghost Covers for Duramax, LS, and SBC engine platforms. As well as AAM 11.5/11.8 differentials. Cummins and other applications are in development.

A: Yes — they’re thermoformed from optical-grade, heat-resistant polycarbonate. Each one is coated with a ceramic barrier for added oil repellency and durability.

A: No noticeable yellowing has occurred in testing. Covers are made from UV-stabilized polycarbonate and ceramic-coated for additional protection. Long-term exposure testing is ongoing, but results so far are excellent.

A: They’re made to run. Durability has been tested under heat, vibration, oil exposure, and real-world driving conditions. They’re not indestructible, but they’re absolutely built for real engines, not just display.

A: Installation is straightforward — apply the provided clear RTV sealant, allow it to partially cure (per instructions), then lightly snug the included hardware. We provide 29 bolts for a 28-bolt install… just in case the engine bay eats one.

A: Each cover is handcrafted, and minor imperfections may occur — particularly in areas like the flange or edge. These do not affect performance or clarity when installed. We inspect every cover and only ship what we believe you’ll be proud to run. Expect show-stopping engine bay visibility, not lab-grade perfection under LED magnifiers.

A: Crazing is a fine, hairline cracking that can appear in the polycarbonate during or shortly after ceramic coating. It typically shows up in high-stress flange areas caused by the thermoforming process.
It doesn’t affect strength or clarity in the visible zone and is mostly cosmetic. We actively work to minimize it, but it’s considered a normal characteristic of coated thermoformed polycarbonate.

A: We don’t currently offer a DIY ceramic kit, and flame polishing is not recommended post-forming. All covers ship pre-coated and flame-finished at the factory. Reach out if you’re chasing something custom — we’re happy to talk shop.

A: No — stick to mild soap and water only. Solvent-based cleaners like isopropyl alcohol, Windex, or ammonia can degrade the ceramic coating over time or cause hazing. Use a soft microfiber towel and wipe gently.