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http://www.turbo-mopar.com/forums/showthread.php?81119-HEAD-vs-HEAD-2-2-turbo-stock-vs-Ed-Peters&highlight=deshroud+valves

I use an already ported head as a guide when porting others. I suspect it's a Mopar head, due to the age, but I have no real proof. The valve bowls of this head are enlarged, but still retain the...

The offset inside the port is what makes the swirl. If you grind that away, you lose the swirl.