<VV> Need some shop advice on exhaust studs

[Patrick Murphy]

Cobalt or titanium drill bit.

On Mon, Nov 9, 2020, 10:41 PM FrankDuVal via VirtualVairs <
virtualvairs at corvair.org> wrote:

> Well, Dave Motohead has a nice video, but he lives in the make believe
> world of rust free cars in California, so wax does work for him. Just
> look at the exhaust manifold in the video, look brand new compared to
> our east coast rusted manifolds. Why, even the ear is full size!
>
> Here in the rusty east, I have developed a fool proof method of removing
> exhaust studs. I did NOT say easy.
>
> Remove manifold from engine.
>
> Mount manifold in sturdy bench vise with the flange up. As level as
> possible so you can align the drill plumb.
>
> Cut bad stud off flush with ear.
>
> Center mark as well as you can the fresh cut stud.
>
> Drill through with a 1/8" bit.
>
> Drill through with a 5/16" bit.
>
> Tap for 3/8-16 new stud.
>
> Yes, sometimes the method will unscrew the old stud, but not usually. I
> do not even try to use an Easy-Out, left handed drill bit, or other stud
> removing methods. I've wasted too many hours dealing with removing and
> then having to drill and tap anyway. I've worn down many 5/16" bits over
> the years. I am good at resharpening with a bench grinder. Sharp is
> good, dull will drive you nuts and waste your time. Slow Speed! Lots of
> lube.
>
> I put in the stainless steel studs as replacements. And brass nuts. Use
> lock washers, as brass on stainless steel will not stay!
>
> Frank
>
>
> Osn 11/9/2020 5:20 PM, Grant Young via VirtualVairs wrote:
> > I need to drill out an exhaust log stud(s), but am not having much luck.
> Just looking for advice on the type of drill bit and any thing else or
> procedure needed. Thanks,
> > Grant
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