th350 - edebrock vacuum ports. what goes where?
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  1. #1
    Rods 'n' Sods Junkie Pittaway's Avatar
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    th350 - edebrock vacuum ports. what goes where?

    may be a stupid question (if they exist)

    fitting up my hotrod for the first time, im unsure of what ports go where. i have a vacuum port on my th350,my dizzy and 2 on the front of my 1405 edelbrock. one large on small.

    could anyone point me in the right configuration of these? i believe the larger one on the carb is a PCV port? do i need this?

    thats for all info as usual

    regards

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    Rods 'n' Sods Junkie Pittaway's Avatar
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    just about see them on thhere sorry for poor photo

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    Official RnS Addict timbo56's Avatar
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    You should have two small ports and a big one at the front, big one in centre is for a PCV valve, not needed but recommended by some people, make sure it's blanked off if you're not using it. The small ones are for the distributor advance, the higher one is ported vacuum for emission controlled engines and the lower one is manifold vacuum for non emission engines, the small manifold (lower) one is also for your transmission vacuum. Make sure the big hole on the rear is blanked off, this is an additional one for servo brakes. this link may help a bit https://www.youtube.com/watch?v=vC3JbNCaOG4

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    Stroker Kustom Jim's Avatar
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    If it's an open hot rod you may not want the ugliness of the pcv tube so as said block the large central port. I use it and create a closed loop hooked in to air filter, seems to even out the crankcase huffing and puffing pressure.

    I have hooked my curve adjustable distributor and th350 to the lower port with t piece to see the full vacuum force underneath the carb butterflies.

    I understand Chevies can like a good advance and the gearbox must surely be more responsive with full vacuum.

    A static vacuum test on my hi compression cammy mill still had 17 on bottom port with vac guage but feck all on upper port so a no brainer for me.


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  8. #6
    Rods 'n' Sods Junkie Pittaway's Avatar
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    thanks guys, so the lower (right) port. tee that to transmission and distributor?

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    Rods 'n' Sods Junkie C10apache's Avatar
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    Quote Originally Posted by Pittaway View Post
    thanks guys, so the lower (right) port. tee that to transmission and distributor?
    I've got mine set up like the sample pic above, I get really good vacuum so never really had any issues

    Sent from my LYA-L09 using Tapatalk

  10. #8
    Official RnS Addict timbo56's Avatar
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    Quote Originally Posted by Pittaway View Post
    thanks guys, so the lower (right) port. tee that to transmission and distributor?
    Yes, like Kustom Jim says, they seem to like a lot of advance.

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