Re: [DML] Exhaust manifolds Studs

["A.H. MacIntosh & Co." <dmc12@xxxx>]

In most American built cars, the exhaust bolts are soft steel, for just that
reason. it's easy to drill/ez-out the remains when they break. Not so if you
use a hardened part. 8.8 would rival pretty much any drill point. 10.9,
forget it... you aren't drilling that without annealing it first. A task
that is pretty much impossible in the Aluminum head.

A bit off-subject, but an experience with coating studs. I thought the steel
studs with surface rust looked like hell... they were the only parts not
nice and shinny my t-bucket. I had them hard chromed... they looked a nice
dull gray... resisted rust rather well. When I went to pull my 6-71 off I
found the reaction between the Chrome, and Aluminum had left the
supercharger stuck to the studs like they were super-glued together.

later I found out that heavy phosphate Parkerizing was the correct answer to
the rusting problem.




----- Original Message -----
From: "Marc A. Levy" <malevy@xxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Tuesday, May 14, 2002 08:20
Subject: [DML] Exhaust manifolds Studs


> You may want to talk to Toby about the studs/bolts. I am not sure what the
optimum material and coating would be.
>
> This is one project I did with little research, I just purchased the parts
I needed from PJ Grady. Like I said before, I think it was CAD plated
steel.. Probably 8.8
>
> I don't think 10.9 would be good, because if a stud did break it would
make it more difficult to remove. I could be wrong.
>
> It would be nice to have some material that does not rust. I think use of
never-seize is an acceptable solution to make sure that in another 20 years
when we have to do this job again it goes easier, but aesthetically I don't
like to see rust! So, the only problem here that may need solving (I don't
know if or when the new studs will rust) is how it looks. Maybe someone who
did this job a few years back can see how their studs and nuts look now?
>
>
> > -----Original Message-----
> > From: dherv10@xxxx [mailto:dherv10@xxxx]
> > Sent: Monday, May 13, 2002 10:53 PM
> > To: dmcnews@xxxxxxxxxxxxxxx
> > Subject: Re: [DML] Exhaust manifolds removal?
> >
> >
> > Marc, If SS bolts arn't good for the aluminum, then what
> > would be the best.
> > Just regular high grade bolts 10.9, higher than what's in the
> > car and maby
> > plate them. I have access to all the bolts and have parts
> > plated by a shop
> > close to me. I can get 7mm bolts from full thread 12mm long
> > to partial
> > thread up to 70 mm long.
> > I just need to know the size needed.
>
>
>
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