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Re: [Land-speed] Rod bolts ( not really LSR)

To: "'Ed Weldon'" <23.weldon@comcast.net>, "'DougOdom'"
Subject: Re: [Land-speed] Rod bolts ( not really LSR)
From: <neil@dbelltech.com>
Date: Thu, 11 Oct 2007 16:06:55 -0700
Good advice, Ed. Just make sure the socket head cap screws are good quality
US- made ones such as SPS Unbrako or Allen, etc. There are lots of foreign-
made fasteners out there but I wouldn't trust them at all.

Regards, Neil  Tucson, AZ



-----Original Message-----
From: land-speed-bounces+neil=dbelltech.com@autox.team.net
[mailto:land-speed-bounces+neil=dbelltech.com@autox.team.net] On Behalf Of
Ed Weldon
Sent: Thursday, October 11, 2007 11:55 AM
To: DougOdom; Landspeed List
Subject: Re: [Land-speed] Rod bolts ( not really LSR)

Doug-- Back in the 30's there was nothing to compare with modern socket head
alloy steel capscrews strengthwise.  If you can adapt these to the 32 chevy
rod with a little machining work then you're home free.  They're hardened
but not so much that they can't be drilled with a good cobalt drill bit.
You might have to get creative to make the head fit the pocket in the rod.
 3/8-24 x 2-1/4" McMaster-Carr part no. 91251A433   $5.24/box of 10
http://www.mcmaster.com/
Also Flat Head style 3/8-24 x 2-1/2" McMaster-Carr part no. 91253A367  $3.24
ea. gives a different head shape that would likely require you to make up
some special countersunk washers.
You might also want to take a look at their steel shoulder screws, which
have different lower heads.  They come in 1/8" length increments around the
2" length you want.  Note that a 3/8" dia shoulder screw uses a 5/16-18
thread; so you'd need to get the right size nuts.  Note that a shoulder
screw will not stretch when you torque it as well as a standard screw, so it
can't be trusted for preloading and locking from the stretching as well. I
suspect with a stock old chevy 6 the preloading wouldn't have to be that
perfect and you're using cotterpins to lock the nuts anyway.
Ed Weldon
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