Bolting

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Anonymous

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Hey, I work in the Nuke power industry. We have requirements for specific tensile strengths on applications. Generally B7 is used for high temp applications
So, if I was to replace my head bolts with a B8 bolt from Acehardware. Would that be right?
Besides the difference in a tensile strength. Harder is not always better. But, the bolt head is smaller.
What's the deal. Alot of guys at work say"Buy from an automotive supplier" they're made for an automobile engine.
Let me know..ZZ
 
The higer grade fasteners have aircraft or aerospace heads, which often don't fit right. There was a link on the Car Craft web site, and it shows the various types. I'm all for better bolts, but if they don't seat, or require allen or star tools to run, then that puts the kyboosh on them for me. In some applicatings, the tensile stress increase causes problems with tear-out or makes other components fail to shear in a crash the way Ford designed it to.

Larry Perkins, a former Aussie GM engineer, who has dobne aircraft engineering tickets, has found that he uses automotive or truck grade fasteners, not the aircraft grade. He said in a 1986 article that ungrading causes problems.

This doesn't include rod bolts, or recipricating components, but does for other fastenings. The fillet radiuses, the washers, all the other bits must be like the original. Going up to 190 000 psi bolts on everything else aside from the internals in the engine isn't cost effective unless you can get a great discount.
 
8) i agree with xecute, using aircraft bolts and hardware causes as many problems as they solve. better would be automotive bolts made from aircraft grade material, such as arp does. that way you replace like with like as far as style goes, but an upgraded material.
 
Okay guys, give me some websites to find engine bolting for my '64 I6, 200 engine. Also for my 170, but I think they take the same as the 200....Please....Thanx..ZZ
 
from Ford Six Parts
HB200A - Ford 200/250ci - 7/16" - $75.00

they're 7/16 coarse if i remember correctly. i'd have to look up the length.

if you don't have your old ones maybe the kits at fordsix are your best bet.
otherwise you can measure the old ones. that's what i did.
 
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