John---The original system of venting the crankcase into the ZS carbs works
well enough for engines that do not have excessive blowby. If you no longer
have the ZS' and have the SU, there is a port on them, intended to give vacuum
advance, that can provide a connection to the engine. It's just a matter of
rigging tubing between the two.
I've not found it really necessary to use vacuum to vent the engine. It's
combustion pressure we're dealing with, so any decent means of letting it out
(without going thru the seals!) should work.
I will admit to fudging here a bit, as I have both the valve cover port venting
into the air filter housing (but not thru the filter itself) as well as a tube
running from the original fuel pump opening blanking plate to the SU vacuum
port. Between the two, there is no crankcase pressure buildup. (I have
connected pressure gauges in key spots to monitor this under full boost).
Then there is the Goodparts system that should work well. Looks pretty trick!
Dick
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