When it comes to venting the Series A, the more than merrier.
That 1/8" "orifice" tip on emissions valve cover was originally for crankcase
inlet air off a carbon canister. Clip off the end and you've a 1/2" crankcase
vent line for a little easier crankcase breathing overboard or to your carb
filters.
Your routing to the "emission" carbs from the timing cover flame arrestor is as
it should be, however....
most 1275 blocks (except the '67 "thin flange" types) have a plate over the
original crankcase mechanical fuel pump port. This is a 1" "vent", because of
it's size REALLY relieves crankcase pressures IMMENSELY. Additionally, you'll
get far less crankcase vapor through the flame arrestor running through the
carbs and into the combustion process once this port is opened as well. Simply
fabricate a fitting and attach a 1" tube/hose or whatever.
It can go overboard through a mini filter (the crankcase "breathes" both ways)
or
into a proprietary catch can or one you can make up from a windshield washer
bottle, coke can, etc.
Cap'n. Bob '60 :{)
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