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I got two sets of free heads but none of the casting numbers match?also thought had to have 4 numbers?
set one
9E31
9E9
set two: said were from boat
6H30
6G7
i'd say the 77's would be just from a pure guess...since usually the earlier they are the better....but since you got 2 sets..pic one and run them and send the others to the machine shop and have them worked over completely for what you want...better flow and such...most shops will let you pay on them as the work gets done...kinda like lay-a-way..
What motor are they for? If it's a 302 then they're both smog heads with hugh combustion chambers and tiny valves so they're no good for anything but thier scrap value.
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