ive sold quite a few sets of the various versions of EZ heads over the last couple of years.
but.....for the most part, it usually boils down to....std port window, or MW port window.
the EZ intake port responds better to opening it up to MW size better than any other head ive seen.
its a fantastic gain for the amount of work involved.

while i am a fan of these heads, i dont feel they will be putting their best foot forward if you use either the EZ or EZ-1 without doing any porting at all.
there is a noticable ridge around the seats that shrouds the valves in the lower and mid lifts.

i get asked quite often if the std port version is worth the extra $$$ over an RPM head. as with most things engine related....."it depends".
it depends on the engine/car combo, and whether or not some additional $$$ can be aloted for some prep work.
the milder the combo, the less gain you'll see. and if the cam isnt solidly over .500 lift, and you dont elect to have some prep work done, you may be a bit disappointed.

440-EZ heads- 4.375 bore, 28" test pressure, radius plate on intake, no flow tube on exhaust.

intake ports;
A- OOTB std port, zero porting
B- open to MW size only, no valve job, no additional porting
C- MW size, PRH valve job, back cut valve, ported chambers, "bowl port", narrow guide boss, tweek short turn

test A and B are the same port/same head. test C is a different head. the A/B head didnt end up getting ported as much as the C head.

lift----A----B----C
.100--72.5/ 73.1/ 71.4
.200-126.8/129.3/144.6
.300-183.0/187.8/208.9
.400-228.8/239.3/261.4
.500-269.2/291.7/307.0
.550-283.1/312.2/321.2
.600-287.9/321.6/330.9
.650-293.5/331.7/341.0
.700-299.2/340.3/351.1

ive got some numbers at the shop for some std port EZ's with the valve and seat work done, along with a "bowl blend", which i'll post tomorrow.
i dont really feel its cost effective to try and "port" these heads if left with the std port opening, since the real problem is actually the opening. the transition from the std opening to the roof is pretty abrupt, and is where the problem is. if you needed to keep the std port window, you could actually fill the area in the roof and pick up flow.
you could also use some of those Hughes intake gaskets that allow you to raise the upper part of the port opening as much as your intake would allow. the more of that ridge you eliminate, the closer you'll get to the flow you get with the MW window.

exhaust ports;

D- OOTB zero porting
E- basic full port and polish, PRH valve job, back cut valve. these ports are small and easy to port. once you do anything beyond a bowl blend on the intake side, just go this far(or father) on the exhaust. compared to how well the intake ports work.....this is the weak side of these heads.
i'll have some "bowl blend" numbers tomorrow.

lift----D----E
.100--52.3/ 56.6
.200- 94.2/105.6
.300-130.2/143.3
.400-164.1/178.5
.500-190.9/208.3
.550-203.3/219.0
.600-210.8/233.5
.650-216.2/238.5
.700-220.7/242.6

i will add this about the exhaust ports. all these heads come with the bowls CNC'd.
on the exhaust, the way that CNC blending meets the valve job on the side away from the exhaust port exit has a noticable impact on how good they will end up being when finished.
if the CNC job comes right up to the bottom of the 45 seat angle, they generally wont be as good as the ones that have more material there for a proper blend. its not a big difference.....but its a few cfm for sure.