Thanks, I found that eventually. Sorry about the blank post...happens when I use the Ipad (and I forget). Unfortunately, the Chevy of the 40s website does not say how much oversized and so I cannot ensure that the holes in the exhaust manifold are not still worn too large. May just give it a try or look for brass bushing that I can insert and drill out to a shaft size I make on my own.
Originally, did the manifolds have bushings installed?
