Knucklehead Heads Evolution...

This work show the changes made to the heads from 36 to 39, the front most heads are the early 36 heads and have primers for injecting fuel directly to the intake ports for cold starting etc.. Toward end of 36 the primers where removed and a plug screws sealed those drills up to late 38, the far heads are typical 39 and still carry the primer boss but those are not drilled anymore, all of the following heads are from the 'small port' 61 ci. engines....if you look at the V shape rockers brackets you can see another evolution as more meat and longer enforcement ribs where added, last detail to note is the change in shape of the cooling fins behind that V brackets going from round and high shape to more shallow profile...

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