Moroso Engine Valve Cover Bolt Kit

Moroso Engine Valve Cover Bolt Kits: Race-Proven Hardware from the Ground Up

When it comes to buttoning up a high-performance engine, the fasteners holding your valve covers in place are anything but an afterthought. Moroso Performance Products has understood this since its founding, and their engine valve cover bolt kits reflect the same exacting standards that have made the brand a fixture in NASCAR, NHRA, and grassroots drag racing pits for decades.

Moroso was started in 1968 by D. Moroso, one of the most successful modified production drag racers on record, who left his racing career to design, test, and manufacture specialized products aimed exclusively at racers' needs — and the performance world quickly recognized that Moroso products were a cut above because they were designed and built for racers, by a racer. That heritage is evident in every valve cover bolt kit the company produces.

A Comprehensive Lineup for Every Application

To make installation as easy as possible, Moroso offers a wide variety of studs, nuts, and hardware kits to accompany all of their most popular valve cover applications. The lineup spans multiple head styles, bolt patterns, and finish options so builders can match both the functional and aesthetic demands of their specific build.

Moroso's valve cover hardware catalog includes hex head chrome nuts, acorn chrome nuts, wing nuts in chrome and multiple powder-coat colors including black, blue, and red, as well as dedicated stud kits for cast aluminum valve covers and bullet-nose stud kits. This breadth of options means whether you're building a show-quality street engine or a no-frills race motor, there's a Moroso kit to match.

Specific kits are engineered for popular platforms. The Moroso Performance Valve Cover Bolt (part 68610) is designed specifically for Chevy small block engines, featuring a 1-3/4-inch length and a 1/4-inch-20 thread size. Its T-handle design allows for easy installation and removal, while the powder-coated aluminum construction ensures durability and resistance to corrosion, making these bolts suitable for both racing and street performance applications. The set includes four bolts, each engineered to clear 4-1/2-inch tall valve covers and address common gasket alignment issues when used with matching studs.

For GM LS-series and other modern platforms, Moroso also offers dedicated bolt kits — such as the MOR-38307, an 8mm x 1.25 thread, 25mm hex-head zinc oxide bolt kit for LS lifter valley plate applications — demonstrating that their fastener engineering keeps pace with evolving engine families. Additional options include 6mm x 1.00 thread Allen-head steel fasteners for GM G-series applications, and chromoly black oxide hardware kits sized for Moroso's own fabricated valve covers on Big Block Chevy builds.

Built in the USA, Backed by a Racing Legacy

Moroso's facility has been manufacturing products in Connecticut, USA since 1968, and all of their fabricated and welded products are built by hand by skilled craftspeople, some of whom have dedicated over 40 years of service to Moroso. That level of continuity translates directly into consistent quality — something racers and enthusiasts who depend on leak-free engines can truly appreciate.

Moroso Performance is known for its commitment to quality, constantly updating its manufacturing processes to meet the demands of both grassroots racers and professional teams. Their valve cover bolt kits are a small but critical example of that philosophy: thoughtfully engineered, properly finished, and designed to keep your engine sealed lap after lap or mile after mile.