>Also in any case, while the headers are out 1) paint them with an engine
>enamel (outside) to protect from rust 2) wrap them with an exhaust wrap,
>(read instructions about wetting it) 3) paint the wrap with a "spray on"
>that is specifically designed for that (after drying wrap in a warm place).
> This will lead to better performance as it will help the carbs to get cool
Consensus on the 510 list appears to be that wrapping headers or cast
manifolds is harmful to the header or manifold over time, especially on a
daily driven car. The contained heat, probably along with any moisture in
the system, literally bake the manifold to death. There are a couple of
coating processes that are more durable than painting and accomplish most
if not all of the heat retention that you're looking for in a wrap. The
best known is the Jet Hot system and another less known is offered by
Strain Technologies (I think). Come to think of it, I think I discovered
this second option from a post here in the past.
Both systems involve coating both the inside and outside of the piece
being treated with a "secret sauce" ceramic like material and then baking
the piece to bond the coating to the piece. I'm going to have the Stahl
header for our E/Prepared car done, as much to preserve the header as to
retain exhaust heat and pass it through the tail pipe. Cost will be in
the $150-$175 range plus shipping.
I know we need rain here, but if I'm going to have the E/P car ready for
Thunderhill and Shasta next July I hope we have the mild winter that's
'71 510 2-dr (Prepared class autocrosser)
'73 510 2-dr (Street Toy)