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I think I have a 33 as the pet cocks are at an angle so not a 32 and there is no vent on the pan. The only thing are the heads have dates of 3-25-48 on the left one with also a casting or part number of 88-6050 R. The right one is 6-11-47 and 68-6049B. I was told when I bought it that it was a 33 but want to make sure when I list it I am being honest. The car is 47000 mile 32. It must be a factory type rebuilt in the late 40's or early 50's. Comments? Thanks for all the replies. John