Okay, I had to do an in-depth research project for an automotive engineering class, so I decided to do something that would benefit me as well as others. Using a SuperFlo flow bench and a bone-stock E7TE as-cast cylinder head (stock valves) with about 90k miles on them, I flowed it. Note that all of the carbon was removed from then valves and ports before testing; no metal whatsoever was removed.
I took readings every 0.050" of valve lift, using a dial indicator with a long lever arm, adjusting air flow until I achieved 28inH2O at each interval. The barometric pressure was 30.05inHg (763mmHg), ambient air temperature was 74.5 deg F, web bulb temp was 62 deg F (not that wet bulb temp has anything to do with it
).
I've not made a graph of the data yet, but here it is in text form:
INTAKE..........................EXHAUST
********************************
Valve Lift ... CFM .......... Valve Lift ... CFM
---------------------------------------------------
0.050 ------- 27.4 ------- 0.050 ------- 23.9
0.100 ------- 38.0 ------- 0.100 ------- 28.6
0.150 ------- 50.2 ------- 0.150 ------- 36.6
0.200 ------- 59.3 ------- 0.200 ------- 46.1
0.250 ------- 65.4 ------- 0.250 ------- 52.3
0.300 ------- 66.9 ------- 0.300 ------- 57.2
0.350 ------- 67.6 ------- 0.350 ------- 60.4
0.400 ------- 68.4 ------- 0.400 ------- 61.2
0.450 ------- 68.4 ------- 0.450 ------- 62.0
0.500 ------- 68.4 ------- 0.500 ------- 62.0
As you can plainly see, these heads fall on their face after ~0.350in of lift on this flow test. I should also state that these are the numbers that
I GOT, so I don't wanna hear any complaints.
It's just for a research project, but I thought I'd share with my fellow 'Stangers!!! It'll be interesting to see how much of a difference a good port & polish will do. I will flowbench test again after each phase (remove thermactor bumps, open up each port, contour valve guides, etc.) along with volumetric values of the port sizes, so stay tuned!
p.s. This test was with no manifolds attached, bare castings w/ valves & check springs only.
p.p.s. I know, this belongs in the Windsor Power forum. I'll move it there shortly. Just wanted to show my ppl in the BOL.
