<VV> re: yoke bolts

[D. Barry Ellison]

Ahhh, NOW I remember what I did.  (TOLD ya I was getting old)  I rebuilt the 
rear wheel bearings about 2 years ago and THAT's where I exchanged the yokes 
for the 66+ style.

I don't have the stock or 'correct' bolts.  My 'common' grade 8's never 
bound up during install, but then they weren't long enough to have shoulders 
on them.  The allens I was hoping to use do have a shoulder but they're too 
hard to drill.

I have a 6" long T-handled allen which I hope with the angle of the drive 
shaft I'll be able to reach the allens.

I'll chase the threads and install the allens for now until I can find 
longer headed bolts for drilling.

Seth makes it sound like a bad thing that I'm also using allens for my 
aluminum valve covers.  They're just tight enough to flatten the lock washer 
against a flat washer which I hope is enough to stop them from coming out.  
Seemed to work fine for several years now.  I'll watch it closely.

Thanks for all the responses.

Barry E
Corsa SC
2 lates (1 coupe, 1 vert), 2 earlies (1 coupe, 1 wagon)
Upstate SC

>From: Sethracer at aol.com
>To: s10birdman1966 at yahoo.com, virtualvairs at corvair.org
>Subject: Re: <VV> re: yoke bolts
>Date: Wed, 24 Jan 2007 12:42:36 EST
>
>
>In a message dated 1/24/2007 9:13:11 AM Pacific Standard Time,
>s10birdman1966 at yahoo.com writes:
>
>Barry,the 'correct' bolts have a taller head to get a wrench on,no
>problem...the un-threaded portion is also necked down from .310" dia near 
>the  head,to
>.285" for clearance in the yoke before the threads start : a 'common'  bolt
>may bind up,causing the strap to be loose or (you) to break the bolt off  
>in the
>yoke...bolts from any RWD GM are useable,if you don't have the Corvair
>ones,but are 5/64ths longer,not an issue if you chase out the threads in 
>the  yoke
>first ; these don't use lock washers,btw...Tom  Z..//
>
>
>
>
>Yes to what Tom said! - In addition the 5/16 thread bolts can have the  
>heads
>cross-drilled for Safety wire. It is a bit of work but will eliminate, or,
>at least, minimize the chance of them coming loose. Another thing to watch 
>out
>for on the 65 is to make sure that nobody has somehow swapped a bolt or two
>from  the valve cover holddowns to the U-joint straps. The bolts are both
>1/4-20 and  almost the same size. The U-joint strap screw is a Grade 8, the 
>valve
>cover  holddown a Grade nothing (Probably a grade 2, but unmarked). Neither 
>one
>  can perform the others job. The Grade nothing may fail if used on the
>U-joint,  the Grade 8 may back out due to lack of "preload" on the threads 
>if not
>torqued to grade 8 specs - which you better not do into the Corvair 
>Aluminum
>threads on the cylinder head. I think that this "unwanted interchange" was 
>the
>actual reason Chevy changed to the larger bolts for 1966 and up.  - Seth
>Emerson
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