Testing cylinder rings with the head off requires a special tool.
Making a Dummy head is easy.
A head gasket gives you the bolt pattern.
7/16 or 1/2 inch steel works very well.
It only needs to cover one cylinder at any time.
You can buy packets of gasket material at most auto parts stores.
Cut the steel to size, bore a hole in the center for the air fitting.

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Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
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Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
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Technical Quality Auditor.
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1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

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Roy, I don't know how it is in Michigan, but there are dummy heads all over the place around here. Just walk out the door and stop at any retail store, or call the telephone company or the cable company and you can get more dummy heads than you could possibly ever use on one engine.

Definatley no shortage of those in Michigan either, I speak from experience.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

That was very mean of you.
I laughed so hard my chest and gut hurt now.
I shall be glad to buy your choice of adult beverage when we meet.