Sale

Exhaust› Headers, Manifolds and Components

Mr. Gasket

Header Bolts 3/8-16 x 3/4 Inch Hex & Socket Head Black Oxide Fits AMC 290-401, Chevrolet Small Block 262-400, Chrysler 383-440 except Hemi, Pontiac 326-455, Oldsmobile 330-455 Mr Gasket

$23.38 $11.89 Save $11.49

SKU: M00S 3420G

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 3420G is a set of header bolts designed to simplify header installation and prevent exhaust leaks. These bolts feature a black oxide finish for corrosion resistance. They are constructed from steel and include both hex head and internal allen (socket head) styles, offering versatility for tight spaces. Each set contains 12 bolts with a 3/8 in.-16 thread size and a 0.750 in. underhead length.

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 3420G

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