Daniel J. Stern wrote:
> On Sat, 8 Jan 2005, Rojo2G wrote:
>
> > I'm changing the head on a 79 GMC truck. The exhaust bolts are very
> > deteriorated. They are a grade something.
>
> Originally probably grade 2.
>
> > Can I buy the matching grade or a higher grade to replace them. Are
all,
> > say, Grade 5 or 8 bolts the same and usuable for the exhaust?
>
> Yes and yes. You can even buy stainless steel bolts and studs, and
brass
> nuts, and never again have a problem with hardware deterioration.

The higher grade bolts give you greater strength and not neccesarily
better corrosion protection. Your best bet is stainless, but under the
environmental condtions of the exhaust system, even stainless can
corrode over time, but not nearly to the extent of regular steel.