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Discussion Starter · #1 ·
Hello, just bought a model 4300 carb. There's a half-inch hole at the back of the carb. My other carb has a tube coming out of that same hole for vacuum hook-up, this one doesn't. My question: should they all have a tube coming out or are some just "dummy" holes from using old castings ? Thanks for any help.
 

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yes there should be a tube there for the PCV valve. Someone removed the one from the back of your carb.
It has to be sealed tight or you will have a vacuum leak
 
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