Mr. Gasket Header Bolt Set - Allen Head - 8mm - 1.25 x 25mm

Fits GM LS Series Engines

PART# 978G

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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 also have a socket head or Allen key drive in the center for just that problem. Sold as a set of 12.


  • M8 1.25 x 25 mm Long
  • Allen Head
  • Fits: GM LS Series Engines 1997-'15
  • Fits: Gen 3 Hemi 5.7L/6.1L, 6.4L 2003 & Up
  • Fits: Ford 4.6L/5.4L Modular 1991 & Up


BrandMr. Gasket
Emission Code5
FinishBlack Oxide
Product TypeHeader Bolts
WarrantyLimited 90 Day Warranty
Part Number978G


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.

Warranty Information

Limited 90 Day Warranty: See Details
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      *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.

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