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Mr. Gasket

Mr. Gasket Header Bolts - 5/16-18 x 3/4 Inch Allen Head - Black Oxide

Fits Small Block Chrysler 318/340/360

Part # 3411MRG Be the first to write a review
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When installing headers you will need header bolts, factory exhaust manifold bolts won't work. These Mr. Gasket Header Bolts are grade 5 for strength and black oxide coated. If you've ever had a set of headers where a socket just seemed it wouldn't fit these might be your answer. These bolts have a socket head or Allen key drive in the center and that compact socket design is ideal for just that problem. Sold as a set of 12.


  • Compact socket head - ideal for tight spaces
  • Black oxide coated
  • Grade 8
  • 5/16"-18 x 3/4" Long
  • Set of 12 pieces

About Mr. Gasket

Using his own '57 Chevy as a rolling testbed, drag racer Joe Hrudka launched the most famous gasket company in the world more than half a century ago. Mr. Gasket is the go-to gasket source for racers with gaskets and fasteners that seal perfectly every time.

Brand Mr. Gasket
Emission Code5
FinishBlack Oxide
Product TypeHeader Bolts
Size5/16-18 x 3/4
WarrantyLimited 90 Day
Part Number3411MRG

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Limited 90 Day: See Details

    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.