Slant 6 power?

agreed but on you have to think of how much bigger of a port they were dealing with (and a 2.02 intake??)...
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Have you ever seen the exhaust port on a 327 small block Chevy head?

I'd be surprised if it's ANY bigger than a /6 exhaust port.

I don't think it is. The intake, yes, but they had 2.02" valves to feed...