<VV> Fwd: Engine disassembly

[Ken Pepke]

The studs are designed to never be removed.  If they come out there will most likely be a small materials failure in the crankcase hence the oversized replacements.  There is a difference in the casting of the '69 crankcase and that difference may also be reflected in some, if not all, of the '68 model year.  Those 'oversized' studs come in I think +.002 or +.003 [I can't remember if there were more]  Some will disagree but others believe that in those thinner casting there is surely internal structure damage and the additional thread diameter on the replacements may not be enough.  [They seem to drive in too easily]  Perhaps it would be OK but, this is one of those jobs one would not wish to have to do over so why take the chance?

Ken P
Wyandotte, MI
Worry looks around; Sorry looks back, Faith looks up.

*************************

> From: <tkalp at cox.net>
> Date: September 23, 2011 9:14:34 AM EDT
> To: Ken Pepke <kenpepke at juno.com>
> Subject: Re: <VV> Engine disassembly
> 
> OK Ken, I know you always have a reason for what you say and I am ready to learn something new today.  What is the case difference on 68/69 cases that you recommend a thread insert . . .  
> 
> (see I do read your posts)
> 
> Terry
> 
> ---- Ken Pepke <kenpepke at juno.com> wrote: 
>> 
>> Having a stud pull out when removing the head retaining nut is not what I would call common ... but it does happen.  Even to California cars.  Oversize studs were made to correct that very problem.  On 68 / 69 engines it might be better to install a 'Heli-Coil'  In this case it is wise to use your favorite thread lock substance.
>> 
>> Ken P
>> Wyandotte, MI
>> Worry looks around; Sorry looks back, Faith looks up.