The Massachusetts A&P re-installing my engine replaced the vent hose with a new one. IO 360 A1A in '66E.   When I got the plane home I removed the cowling and had my A&P look over the the installation. Overall he thought it looked like an excellent job with lots of new hoses and everything well routed and secured but had some concern that the end of that vent hose ought to have a whistle valve, I think that's what he called it, an end piece with a side hole that would prevent sealing i