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Old 09-27-2017, 10:19 AM
  #20  
Mr Cox
 
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Yes, the very early ones came with a regular plug and a head that was a bit special (see below), but that was before the one you have, as far as I can tell.

The early clamp rings had a slightly smaller internal diameter and the later heads will not fit inside the those clamps without modification. From Merlin you can get a clamp and three heads in package which would fit your engine.

There is also the Nelson head which perhaps is the most performant one, if every bit of extra rpm is important. There are/were also turbo-plug heads from John Valentine that work well.
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