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I will be able to tell you what a ported ones flows in a couple of weeks. I have a flow sheet from a regular SOHC I have ported and the magnum will out flow it easily. my regular, ported SOHC flowed 185 cfm at .350 lift at 28" on the exhaust and 232 cfm intake at .350. The intake is the same between magnum and sohc. I have several to compare to at my shop.
 

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I wouldn't oval out the ports on the Magnum head. I'm betting that extra port volume would only hurt performance.
 

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It depends on how wide you opened it up.. If it's not too wide, then it will be just fine. Don't touch your floor and smooth it all out.
 

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My experience is that neon heads like their exhaust ports wider more than a raised roof. At least thats the info I am getting from our flow bench.
 

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You can clean up any imperfections, I have found better flow going wider than taller on the neon heads. The only exception was the SOHC head (Not the Magnum) That little buggar needed all the help it could get, but even then, I ended up going alot wider than I did taller. The magnum just has a better designed port. You want to make sure you cleaned up the exhaust bowl area good too. They too seem to have the nasty ridge around that needs to be tapered down.
 
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