Have a 68 GTO convertible,that i originally thought was Pontiac based on the color.I found numbers stamped on the ,passenger side at about 10 o'clock left of the water pump.386602 with YN,below the numbers.The closest i could decode was up to the first 6 on an Olds motor..Anybody have a clue as to the year?..By the firing order its a 350 thanx
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