Reply to "Identifying Cleveland Heads"

In general, a 4 in the corner of the head without a dot is a sure sign you have a quench chamber head; most likely a D0AE casting with 63cc chambers although the first month (June) of D1AE castings omitted the dot as well. Heads having a 4 with a dot in the corner are not as easy to identify.

The casting numbers are cast into the bottom of an intake port runner, to view the casting number requires removal of the intake manifold and viewing the bottom of the intake ports with a mirror and flashlight.

In lieu of pulling the intake manifold, you can remove a valve cover and read the casting date which is cast into that area of the head. The casting date is a 3 or 4 digit number composed of a number indicating the year, a letter indicating the month, and one or two more numbers indicating the day of the month. January 11, 1971 = 1A11

4 no dot - D0AE casting - 63cc quench - 7/69 thru 5/70 - 9Gxx thru 0Exx

4 no dot - D1AE casting - 66cc quench - 6/70 ............. - 0Fxx

4 + .dot - D1AE casting - 66cc quench - 7/70 thru 1/71 - 0Gxx thru 1Axx

4 + .dot - D1ZE casting - 75cc open.. - 4/71 thru 4/72 - 1Dxx thru 2Dxx

4 + .dot - D3ZE casting - 78cc open.. - no data

The casting date data is based on a survey performed at the Cleveland's Forever Forum, the data was rather incomplete in regards to D1ZE and D3ZE castings. Although its not reflected in the survey data, I listed the earliest D1ZE castings as being cast in April 1971 (1Dxx) because 1971 Cobra Jet motors were installed in Mustangs, Torinos, etc beginning May 1971.

The D1ZE castings have 75cc open combustion chambers and 2.19"/1.71" valves. D3ZE castings were installed in the motors equipped with exhaust gas recirculation, these should be the OEM heads installed on the motors of all Pantera L models. These heads have 78cc open combustion chambers and 2.04"/1.65" valves. although the valves were smaller the ports were the same size as the ports found in all other 4V head castings.

There were D1AE-GA castings having 66cc quench chambers cast in 1974 and 1976 (4xxx or 6xxx date codes) in order to provide a supply of quench chamber heads for racing.

-G