Erik:
Before going any further, check the flange thickness of the
manifold and make sure it is the same as your intended intake manifold.
There are two thicknesses of manifolds used on the B. You can
interchange them by making a stepped hold down washer, but it is a pain.
Now may be a good time to get the correct manifold before putting labor
into the damaged itme.
If you have a drill press I would recomend helicoiling the
manifold. A bit more expensive than tapping, but in the long run it
will hold up better.
Kelvin
-----Original Message-----
From: Erik Brzoska [mailto:mowog77@hotmail.com]
Sent: Monday, December 07, 1998 11:59 AM
To: mgs@autox.team.net
Subject: Exhaust manifold studs
I have an exhaust manifold out of a 72B that I am prepping for my 77B,
when I do the carb conversion. As I mentioned the manifold is from a 72
(read: rusty beyond belief) and it still had the flanges and parts of
the old pipes still connected, since the guy I got it from had cut it
out rather than attempt what I did.
I used some PB Blaster on the stud nuts the day before and then a half
hour before I actually started turning the nuts off.
Well needless to say 4 out of 6 of them snapped the studs and the ones
that did come off I would not want to put a nut back on to!!
Has anyone else on the list had this experience or has anyone ever had
to drill out studs of any sort and retap a size bigger? If you have,
please advise me on a course of action.
I was just going to set the manifold up in my drill press and drill the
studs out if possible, then tap them out and buy new studs.
The only real snag that I can see (and I have limited vision - hindsight
is always 20/20) is that I will have to drill out the new muffler
flanges to fit the non-standard exhaust manifold studs.
TIA,
Erik.
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