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Gohawks 02-13-2020 03:31 PM

Another carb question!!!
First I would like to thank the group for your wealth of info and your willingness to share it, this forum is great. I am getting ready to do a Rochester to Weber carb swap and I am wondering what to do with all the vacuum lines that wont be used in the new configuration. I'm not sure witch ones can be plugged off and what may need to go somewhere else. Any ideas on articles of pics/ diagrams that might help? Thank you. (1982 gm151ci. w/4spd.)

JeeperChris 02-13-2020 08:11 PM

Re: Another carb question!!!
If a vacuum line is in use now, a carb swap will not change that, it will still need to be used.

TnCJ 02-13-2020 08:47 PM

Re: Another carb question!!!
You will need at least two vacuum lines. One for the vacuum advance on the distributor and one going to the PCV valve on the valve cover.
The rest depends on whether you have smog inspections or not.
If you have no inspections the rest can be plugged.

Gohawks 02-13-2020 09:50 PM

Re: Another carb question!!!
I do not have emissions testing here so I should be ok there. I am mostly concerned with the line that goes back to the (I'm assuming) charcoal canister under the rear drivers side fender. It sounds like I can just plug that off. From
what I understand this carb swap not only improves some performance but will make timing and air/ fuel adjustments easier. I do plan on an MSD box as well. Thanks.

Belizean 02-13-2020 10:17 PM

Re: Another carb question!!!
I run a Webber and MSD box and is a great improvement

Gohawks 02-14-2020 12:12 AM

Re: Another carb question!!!
That is GREAT to hear, I am hoping for the same results. Thanks

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