AFR Heads

After looking at the chamber pics EA posted, here’s my take on what’s going on with the way the bowl cut intersects the SSR……

If you look at the proximity of the outside of the 45* seat angle, and the OD of the seat insert, you can see how much closer the top of the 45 is to the edge on the AFR head.
The “valve job” appears to be “bigger”.

If you size the bowl appropriately for the larger diameter seat OD, the cutter used for that will remove some material from the SSR area……and leave the cliff you see in the pic.
The same thing happens when you install larger diameter valves.

That is my assessment……..going by pics I’m looking at on the net……..and not having the two heads side by side on the bench to measure and compare in person.

That being said, I’m doubtful I’d get the same flow numbers they’re publishing, on my bench……..if the production heads actually look like that.
As for ex flow, AFR typically tests that side of the head with a flow tube attached.
But even with a tube attached, the ex numbers look pretty lofty for a head like that with zero porting.