Sale

Exhaust› Headers, Manifolds and Components

Mr. Gasket

Headlock Locking Header Bolts 3/8-16 x 3/4 Inch Set of 16 Fits Chevrolet Big Block 396-454, Ford 289-351W, 426 Hemi, Ford 429/460 Mr Gasket

$65.95 $60.69 Save $5.26

SKU: M00S 2231G

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 2231G is a set of 16 locking header bolts designed for performance engine builders. These bolts feature a 3/8 in.-16 thread size and a 0.750 in. underhead length, with an internal allen/hex head style. Manufactured from stainless steel, they are engineered to withstand a tensile strength of 150,000 pounds per square inch.

These HEADLOCK locking header bolts eliminate the need for separate lock washers. They incorporate 24 equally spaced serrations on the head face that grip the manifold surface, preventing loosening due to vibration or metal expansion.

Special attention should be paid to using anti-seize lubricant on all stainless steel fasteners. The fasteners come in a natural, polished finish.

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 2231G

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.

View Full Return Policy