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I just built a 355 with ProMaxx Maxx 183 heads. Engine runs great and not looking for new heads, but I was looking at the AFR 195 Enforcer heads. I had never seen them before. I got to looking at the advertised flow numbers for the AFR's.
AFR .200-133, .300-188, .400-226, .500-250, .600-251
Maxx .200-137, .300-198, .400-241, .500-249, .600-250
Maxx183's flow a little better at lower lifts, but they are pretty equal at .500.
My question is how does the fact that the AFR's have a larger intake port volume, but deliver the same amount of CFM's, affect the engine's performance?
I'm just curious. Seems like the intake charge would be slower in the 195's, but not sure what effect this would have.
What do you think?
 

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I just built a 355 with ProMaxx Maxx 183 heads. Engine runs great and not looking for new heads, but I was looking at the AFR 195 Enforcer heads. I had never seen them before. I got to looking at the advertised flow numbers for the AFR's.
AFR .200-133, .300-188, .400-226, .500-250, .600-251
Maxx .200-137, .300-198, .400-241, .500-249, .600-250
Maxx183's flow a little better at lower lifts, but they are pretty equal at .500.
My question is how does the fact that the AFR's have a larger intake port volume, but deliver the same amount of CFM's, affect the engine's performance?
I'm just curious. Seems like the intake charge would be slower in the 195's, but not sure what effect this would have.
What do you think?
It's always been my understanding that the more flow you have with a smaller port creates higher velocity which in turn creates more torque. The fact it flows well high on the lift should mean power won't drop off as quick at upper RPMs. Depending on cam of course.
 

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Just an FYI...the AFR Enforcer head is the good import casting talked about quite a bit. First came to the US under the name ProHeader, now also sold as Skip White's NKB head, Assault Racings house brand, RPC, DeepMotor, and probably a few more I'm overlooking.
It is a copy of the Dart Pro-1 Platinum.

Only thing AFR is doing different is adding their 8mm guide and valve package, with beehive springs.

Fully machined Bare castings with standard 11/32" valve guides can be had for $170-180 range if you want to build your own.
 
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