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Engines and Components› Cylinder Heads and Components

Mr. Gasket

Headlock Locking Header Bolts 3/8-16 x 3/4 Inch Set of 12 Fits AMC 290-401. Chevrolet Small Block 262-400, Chrysler Big Block 383-440 Wedge Engines, Pontiac 326-455, and Oldsmobile 330-455 Mr Gasket

$55.29 $51.15 Save $4.14

SKU: M00S 2230G

In Stock
In Stock
Ships by Jul 29
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Mr. Gasket HEADLOCK Locking Header Bolts are a set of 12 stainless steel fasteners designed to simplify header installation. They feature an internal allen/hex head with a 3/8 in.-16 thread size and a 0.750-inch underhead length. These bolts eliminate the need for lock washers and utilize serrations to lock onto the manifold surface, preventing backing out due to vibration or thermal expansion.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandMr. Gasket
Part NumberM00S 2230G

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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