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SU vacuum source 444-544

posted by  longhorizon on  Sun Apr 29 14:24 CST 2007
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last visit: Sat Oct 18 15:42 CST 2014
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I'm getting ready to install a vacuum gauge. My intake manifold is early style (no vacuum source). Where on either SU would be a spot to attach a vacuum hose?
The car is together and I definitly do not want to drill and tap at this point. (If that's what it takes, I'll have to add to next winter's project list!).

Kai S
'67 Duett








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    SU vacuum source 444-544

    uid 5098's pic
    posted by  Sil on  Mon Apr 30 09:52 CST 2007
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    last visit: Fri Oct 24 07:24 CST 2014
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    Kai,
    Even the very early B18 manifolds like mine, a 1962, have a screw plug at the radiator end. It may take a couple of days' soaking in PB Blaster and/or heat to get it out. In fact, I had to weld a bolt onto it to get it to turn because previous attempts at removal had stripped the socket.
    Bob S.








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      SU vacuum source 444-544

      posted by  Danny on  Mon Apr 30 14:36 CST 2007
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      last visit: Mon Oct 6 22:01 CST 2014
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      The earlier 2 bolt air filter carb bodies with vacuum advance distributors had a barbed ferrule type brass inlet inserted into a small diameter (1/8" or less) hole which was drilled into a machined boss on the top face of the rear carb outboard of the piston bell. Someone with an earlier original setup should be able to supply a photo. It wouldn't be that big a deal to pull the filter and drill the hole in place. I don't even think the barb was threaded - just a press fit, tap it in. If you're worried about filings you could always just pull the rear carb and do it on the bench or drill press.








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    SU vacuum source 444-544

    posted by  Ron Kwas on  Sun Apr 29 23:36 CST 2007
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    last visit: Fri Oct 24 04:03 CST 2014
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    Kai;

    ...is this strictly for a gauge? (I've found these of limited use), or is it for vacuum for your dist (in which case anywhere downstream from the throttle would do it)...the HS6s often have a little machined area for a vacuum fitting...a close inspection will reveal where on the carb body this is (I've seen it even on the mounting flange...maybe someone can supply a pic)...otherwise a tiny hole in the manifold will do it...

    Cheers







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