If your engine was here at this point I would pull the intake off, seal the crankcase vents off, and pressurize the crank case with 2 or 3 lbs of air pressure. Then spray soapy water into the intake ports and look for bubbles. Doesn’t take a lot of pressure, I think a shop vac that has a pressure line could do it also. No fun redoing stuff you already work on!
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