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Pressure builds up in the crankcase on all internal combustion engines. If your 455 is an older model it should have an overboard vent but you still may have some pressure relieved through the dipstick tube. Newer engines use a PCV or positive crankcase ventilation valve to relieve the pressure. You probably won't have any vented through the dipstick tube if that valve is working properly. They are pretty cheap (3 to 4 dollars) and easy to change. If your pcv is clogged it may also cause your engine to use more oil than it normally would.

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Q: What would caouse air to come out of dip stick on 455 olds engine?
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