Moroso Engine Covers

Moroso Engine Covers: Race-Engineered Valve Covers Built for Performance

When it comes to engine covers that go beyond mere aesthetics, Moroso Performance Products occupies a category of its own. Founded in 1968 by drag racer Dick Moroso, the company built its reputation on designing parts that address real problems faced on the track — and their engine covers are no exception. From the earliest days, Moroso pioneered the development of tall valve covers to accommodate aggressive valvetrain setups, and that engineering DNA is still evident in every product they offer today.

Precision Construction: Billet and Fabricated Aluminum

Moroso's engine cover lineup centers on two distinct construction methods, each suited to different racing applications. Their CNC-machined billet aluminum valve covers are cut from solid billet aluminum bar stock, delivering exceptional rigidity and dimensional accuracy. The flat, precision-machined sealing rail creates an airtight seal that allows an engine to pull greater vacuum — translating directly into improved ring seal and measurable power gains.

For builders who need more flexibility, Moroso also offers fabricated aluminum valve covers featuring a one-piece billet rail that is CNC machined to ensure a precision-flat mating surface. The smooth transition where the billet rail meets the cover body eliminates trapped oil pockets, making removal and reinstallation cleaner and faster in a race environment.

Coverage Across the Most Popular Racing Platforms

Moroso's engine cover range spans a wide variety of high-performance applications. Small Block Chevy builders can find options sized to clear Jesel and T&D rocker shaft assemblies, including covers designed specifically for 4.5" Rox Bore Space and 13-to-23-degree cylinder heads. Big Block Chevy applications are equally well represented, with covers available in multiple heights — from 3" to nearly 4" tall — featuring exhaust and intake side pockets to clear even the most aggressive aftermarket valvetrain combinations. GM LS and LT platform enthusiasts are covered as well, with billet LS valve covers that integrate Holley/Smart Coil Pack mounts directly into the cover design, simplifying underhood wiring in EFI builds. Ford modular engine builders will find fabricated aluminum options for the 4.6L and 5.4L 3-valve engines, complete with provisions for factory cam timing solenoids and coil mounting.

Finish and Customization Options

Each Moroso engine cover is designed with the engine builder's needs in mind. Covers feature a broad, flat top surface expressly intended for custom engraving — a common practice among professional engine builders who want their name on display. The covers can be left in their natural aluminum finish for a purposeful race look, or finished by polishing, chroming, or powder coating to suit a street performance build.

Mounting locations are notched with socket-sized clearances for quick installation and removal — a small but telling detail that reflects Moroso's racer-first design philosophy. Whether you are building a sprint car, a drag race big block, or a modern LS swap, Moroso's engine covers are engineered to the same standard that has made the brand a fixture in NASCAR and NHRA/IHRA paddocks for over five decades.