<VV> Stud Advice

BobHelt@aol.com BobHelt@aol.com
Mon, 10 May 2004 00:22:57 EDT

In a message dated 5/9/04 5:26:57 PM US Mountain Standard Time, 
r.gault@sbcglobal.net writes:

> I'm working on a '65 block.  A number of the upper studs were in pretty bad
> shape, so I decided to try to replace them.  I found that they were all 
> pretty
> loose, coming out with less than 10 ft-lbs.  So, I decided to replace them 
> all
> with .003 over studs.  Well, of course, it turned out that only 11 of the 12
> were loose.  One of the uppers (front stud on #4) that goes into a bearing 
> web
> turned about one turn and then began to bind up.  When it got to 50 ft-lbs
> about 1/2 turn later, I decided to just screw it back in and leave it.  It
> went back in pretty hard.  It feels like it had picked up a piece of 
> aluminum
> in the threads.
> I'm guessing it will be OK.  What do you smart guys think?  It's going in my
> 3.6L project.

Hi Roger,
Wow, a 3.6 L Corvair engine. That is stretching things quite a bit. 
Seriously tho, I suggest that you run the Larry Forman pull test on each of 
those studs. He uses an appropriate length narrow CI pipe over each stud and 
tightens the stud nut against the end of the pipe to 40 lb-ft. If it will take 
that the stud is good and secure.

Another thing, The .003 OS studs are NOT for strength, but are for oil 
leakage control. I doubt that you have accomplished anything by going to these 
studs.  So I would strongly suggest (especially for 3.6L!!!) that you Helicoil each 
and every to stud with a 7/8 inch long coil.  Do not use anything shorter 
than this unless you put two short ones end to end to make 7/8 In. 
Bob Helt