AFR MOPAR 340 HEAD TEST!

PRH said

On something similar to what was used for this test, I wonder how much power difference there is between the AFR and an ootb SM head……which at the moment are about $850/pr less money.

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OOTB ProMaxx is the same casting as the AFR but with an 11/32 valve. In my testing the ProMaxx flows slightly better than the SM, but only slightly. So the only difference in power would be in the RPM potential of the 8mm valve vs the 11/32. That is unless AFR is doing their own valve job and blend which I kind of doubt. The AFR head displayed at PRI last December looked like a Chinese valve job.

Edit - Another possible difference between the OOTB AFR and the SM is a back cut on the valve.