Join Date: May 2007
Location: Bloomington, IL
iTrader: 0 reviews
A standard short side port typically nets 340 cfm on the intake side and 220 cfm on the exhuast side. All out porting has produced some heads with 380+ CFM intake and 250+ CFM exhuast. So yeah, they will outflow many if not most aluminum heads.
BUT flow isn't everything. These are low velocity ports, so if you want to use that CFM you need to be up above 6000 rpm.
The real ticket with these heads is epoxy filling part of the ports (especially the exhaust and the lower part of the intake port). Then you can raise the exhaust runner with some plates. If you have your porting and filling done by someone that knows what they are doing you can have a pretty bad ass set of iron heads, but the cost will not be much cheaper than a set of AFR 225s.
Also, cleveland heads are big, bigger than windsor heads, and heavy, about 75 lbs each. So factor that into the equation as well.