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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 10-05-2005, 03:37 AM   #1 (permalink)
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hey triumph einsteins.......in an effort to beautify my beloved bonnie,,,im replacing most my hardware with stainless..question , the bolts holding my head on seem to have a head bout 1/2 inch head on them.....my replacement stainless just have a standard size head .....meaning smaller...worst case seniero...my head blows off ( i hate it when that happens).......do you think i have reason to worry ....or ride on with a pretty head ... lol .....tom
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Old 10-05-2005, 09:24 AM   #2 (permalink)
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My 78 bonnie had been fittied with after market, stainless-steel head bolts, on the outer four. They had allen-head, instead of conventional 6-point head. I replaced them this spring with OEM hardened steel bolts because one of those stainless bolts began to break, crack, seperate (down in the threads portion). Darndest thing I ever saw.

My trusty/crusty, mechanic/guru advised the OEM bolts as they were stronger than the stainless.

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Old 10-05-2005, 02:28 PM   #3 (permalink)
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I rebuilt mine with stainless head bolts, I got the various designs from: http://www.manx.co.uk , been using them nearly 7000 miles, have had no problems with the items supplied.
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Old 10-05-2005, 07:11 PM   #4 (permalink)
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I was under the impression that ss head bolts was a real no no!!

Stainless steel expands with heat almost twice as much as normal mild, hardened or tempered steel.

This allows your head/rockers to get up and have a walk with all that new found freedom.
I do remember a gent that did this on a motorcycle, and the oil pissed out and the head gasket kept blowing out. He solved the problem by going back to std studs and headbolts.

I know that there are two [at least] types of stainless, austinetic and martensetic, could be one type works OK.

Maybe a metallurgist among us can prove/refute my supposition?

[ This message was edited by: tridentt150v on 2005-10-09 16:41 ]
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Old 10-08-2005, 10:38 PM   #5 (permalink)
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Hey tnsen, why not cad plate your bolts? They'll look great when done and your old bonnie was happy with them.
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