Bolt head markings

  • ilikescars
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03 Aug 2016 21:56 #31456 by ilikescars
ilikescars created the topic: Bolt head markings
Hi: Anybody know if the bolts that hold the exhaust pipes to the manifold
on an 810-812 have any type of marking? Perhaps a "W"? Or maybe just plain?
Copper coated?
Mark

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03 Aug 2016 23:35 #31457 by 1748 S
1748 S replied the topic: Re: Bolt head markings
I was told that any bolt on the engine will have a W on the head or could be plain too. The W mark is a raised letter too. Its not simply stamped into the head.. Sad too cause we sure could "make" head bolts or any engine bolt for that matter. I think the most important item on bolts is the thickness of the hex head other than the modern markings we see on most any new bolt today. But if your restoring a runner any bolt will work.

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04 Aug 2016 12:58 #31460 by ilikescars
ilikescars replied the topic: Re: Bolt head markings
Thanks for the reply. Come to think of it: the bolts may be marked with a "30" same as Auburn.

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05 Aug 2016 03:40 #31464 by mikespeed35
mikespeed35 replied the topic: Re: Bolt head markings
If you are going to use "any bolt" be sure it is the proper grade for the application.
Cordially Mike

Mike Huffman

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05 Aug 2016 11:22 #31467 by Curt Schulze
Curt Schulze replied the topic: Re: Bolt head markings
High hex grade 9 bolts with W, N, 30 (raised marking) are available in most popular sizes.

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt

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