I tried this on a 1965 dodge van and it didn't work. I guess it depends on what the manifold is made of. If it's cast iron forget it. I had no luck with any kind of weld tried on it. I'm not a welder so had others doing the work. Maybe they know something we didn't.  Paul
"Dan M." <vegadan@xxxxxxxxx> wrote:  
I noticed on ebay that somebody is selling directions to split a 258 
exhaust manifold.  Has anybody ever done this?  Is it worth it?  It 
seems to me that it would be a good idea, but I've never heard of 
modifying the factory exhaust manifold in this manor.
Thanks,
Dan