yar, I believe your '36 has a unique fill cap on the draft tube so if you don't want to butcher that one any later tube could be modified for the pcv. I was advised to use a pcv valve from a later inline with near the same displacement like a 230 or 250 inline. Re. attempting to measure the vacuum, don't see the need all I can tell you that this modification is simple and it works. We cut off the 'down' draft tube up near the top and welded in a thick washer and tapped as described.
Also, what ever old draft tube you use make sure it's boiled out or completely cleaned in some manner, most of these things are chuck full of packed crud.
Last edited by JiMerit Boltr#43; 03/20/2018 4:50 PM.
