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The heads i have are phace 2 chevy bowite heads. 2.08 and 1.6 valves 7/16 screw in studs and guide plates. They have a verry nice mild port work. Roller springs cam and roller lifters included.we went to aluminum heads. these heads only have 4 nites on them. $500 for everything. If your intrested about casting numbers call me 501-827-1734 o yea they are 64cc Thanks Larry Or trade for (What you got)