You will not have a problem running a domed piston with that head. The term low compression is used to described a head that is designed to burn kero or distilate fuels. You can mill the head down to increase compression but you will need to take it down quite a bit to get even get close to a stock high compression head. The diffrenence in compression is, the low compression will have around 90 psi while the high compression gas will have around 130psi. As D said check your tag for a suffix it could have been ordered like that from factory. If your not planning on pulling or heavy tillage then that head will be fine. What are you planning on doing with that Super M?
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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