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Holes is back of head

E
Jan 26, 2018
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Dad borrowed sled. Said over heated... got it home. No coolant. Poured coolant in and it dumps out of a hole in yhe back of the head as fast as your pour it in. What is this hole? There are two about center of each cylinder. Goes directly into water ports. Were there frost plugs of some sort there that popped? Is the head junk? I cannot fond the answer anywhere. Thanks for any help!
 
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