i'm going to re-visit the EZ head for a bit, since its the most popular.....and since there are more options with it.

previously i compared the OOTB std size port vs opening up the port entrance to MW size, without doing any other work.
here i'm going to take a different approach.
as i said before, i dont feel that running the std port EZ in its OOTB form is going to give you the benefits of this style of head.
yes, they require way, way less work than a RPM head to get solidly into the 300cfm range, at a lift thats within reach of a cam that would be used in a hot street/strip combo.
but.....they do need a bit of tweeking to get them there.
then, i'll take that prepped/blended std port....and open the port entrance to MW size.
what these numbers will represent is how 90% of the EZ heads i sell end up being prepared.

i make sure the guides are properly fitted, re-do the valve job, back cut the valves, blend the bowls, blend intake port entrance, and port the chambers.
we'll call that a "stage I" with ported chambers.

again, 4.375 bore, 28" test pressure, radius plate on intake, no flow tube on exhaust

intake ports;

A- OOTB, std port opening, no porting
B- stage I with ported chambers, std port opening
C- stage I with ported chambers, MW port opening

lift----A----B----C
.100--72.5/ 74.9 /74.9
.200-126.8/149.3/149.3
.300-183.0/206.2/207.9
.400-228.8/250.6/254.3
.500-269.2/289.9/299.2
.550-283.1/302.9/314.2
.600-287.9/308.6/325.4
.650-293.5/312.3/336.6
.700-299.2/314.9/344.1

exhaust ports;
D- OOTB, no porting
E- stage I with ported chambers

lift----D----E
.100--52.3/ 53.0
.200- 94.2/106.6
.300-130.2/142.6
.400-164.1/174.8
.500-190.9/202.6
.550-203.3/209.6
.600-210.8/216.0
.650-216.2/223.6
.700-220.7/228.6

here's some numbers from the last set of EZ295's i sold.
this is after i recut the seats, blended the VJ into the bowls, and back cut the valves.

EZ295-

lift----I/E
.100--66.0/55.8
.200-143.0/108.0
.300-213.8/141.0
.400-268.8/174.5
.500-313.0/202.4
.550-326.4/202.6
.600-336.0/221.0
.650-347.5/228.6
.700-352.1/235.0
.750-356.0/237.5

EZ-CNC 325, after PRH valve job & blend(intake test only. exhaust port is the same as a CNC 295).
offset intake rocker required.

lift----I
.100--72.6
.200-155.0
.300-223.0
.400-273.4
.500-317.5
.550-329.0
.600-341.6
.650-351.3
.700-359.8
.750-367.4

PRH hand ported EZ: PRH valve job, back cut valve, basic full port and polish. std offset rocker okay.

lift----I
.100--73.1
.200-149.1
.300-213.5
.400-266.7
.500-310.4
.550-325.4
.600-337.7
.650-347.1
.700-354.6
.750-358.3