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Holley 750 vacuum line questions #1737960
01/24/15 10:47 PM
01/24/15 10:47 PM
Joined: Jul 2005
Posts: 1,723
North Austin
KnuckleDuster Offline OP
top fuel
KnuckleDuster  Offline OP
top fuel

Joined: Jul 2005
Posts: 1,723
North Austin
I have a Holley 750 vac secondary carb,this carb only has one small vacuum port on the pass front corner instead of small and large.... (why?)

I am running a vacuum pump to my power brake booster so I don't need the rear port for the booster. My main question is- can I use the rear port to go to my PCV?

Also, where can I get the right grommet to run my PCV in the knockout rear hole on the driver's side MP cast valve covers instead of up front in the twist off oil cap hole?

Re: Holley 750 vacuum line questions [Re: KnuckleDuster] #1737961
01/24/15 11:02 PM
01/24/15 11:02 PM
Joined: May 2003
Posts: 15,487
Florida
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scratchnfotraction Offline
I Live Here
scratchnfotraction  Offline
I Live Here
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Joined: May 2003
Posts: 15,487
Florida
yes you can use the rear port for PCV

need to check to see if the small port is ported vac or full vac, that would go to dist vac pod if ported vac.

you should need a 1-1/4 to 1 inch rubber groumet for the knock out hole which = use a hole saw and don't knock it out with a BFH.


Re: Holley 750 vacuum line questions [Re: scratchnfotraction] #1737962
01/25/15 12:13 AM
01/25/15 12:13 AM
Joined: Jul 2005
Posts: 1,723
North Austin
KnuckleDuster Offline OP
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KnuckleDuster  Offline OP
top fuel

Joined: Jul 2005
Posts: 1,723
North Austin
Quote:

yes you can use the rear port for PCV

need to check to see if the small port is ported vac or full vac, that would go to dist vac pod if ported vac.

Thanks! The one corner port is what I had VA hooked to but looks like it should be run off timed vacuum on the pass side instead. How do I check it?

you should need a 1-1/4 to 1 inch rubber groumet for the knock out hole which = use a hole saw and don't knock it out with a BFH.

I did use a saw,was running a 1" pcv off the rear fitting (for a Ford IIRC),but hose is too big for that corner fitting.Thought I might have had it all screwed up but seems like the lowest ports would both be full manifold....learning...bear with me.
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Re: Holley 750 vacuum line questions [Re: KnuckleDuster] #1737963
01/25/15 12:25 AM
01/25/15 12:25 AM
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
I think the one on the front on the carb base is manifold and the one on the pass side of the metering block halfway up is ported. Mancini & others have grommetts, measure the size(s) you need. As you know PCV on one valve cover/breather (open or closed) on the other valve cover


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