3/8-16 x 3/4 Header Bolt Set (12) Combo Hex & Soc

The MR. GASKET 3/8-16 x 3/4 Header Bolt Set (12) Combo Hex & Socket is a purpose-built fastener solution for V8 engine builders and performance mechanics working with AMC, GM, and Mopar powerplants. This 12-piece header bolt set combines dual head profiles—hex and Allen socket options—in a single package, eliminating the need to stock separate fastener types for complex engine installations where bolt access varies between mounting locations.

The 3/8-16 thread diameter and 3/4-inch length specification fits the standard header flange pattern on B-series, RB-series, and common V8 configurations. Black oxide finish provides corrosion resistance and reduces galling during installation—critical when working with aluminum or iron cylinder heads prone to seizing. The combo design means each bolt accepts either a standard wrench or Allen key, giving technicians flexibility during assembly and future maintenance, particularly valuable in tight engine compartments where wrench swing room is limited.

This set serves engine builders, performance shops, and serious enthusiasts rebuilding or modifying V8 engines where OEM header bolts have been removed or damaged. The 12-count quantity covers a complete header set on most V8 applications, though builders should verify count against their specific manifold configuration. MR. GASKET's reputation in performance fastening makes this a reliable choice for applications where bolt failure risks warping or cracking cast iron headers.

Header bolts experience thermal cycling and vibration stress that standard fasteners cannot tolerate. Choosing proper specifications—correct diameter, length, and finish—directly impacts header seal integrity and long-term reliability. This set's black oxide treatment and dual-head design address both performance and practical workshop needs in one package.