Telling the difference between pr3-4 itr/b16
My friend wants to give mr a type r head it's stamped pr3-4 which also some b16 head are stamped the same way...
I want to know what on r inside the head specifically can tellthem apart, iv read that behind where the dizzy goes itssupposes to be painted green somewhere? But he said there is no green mark?!
Any help is appreciated
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