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Old 12-31-2012, 07:06 PM
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rochester quadrajet

I have a 1975 gm quadrajet that Im trying to run on my 1972 c30 chevy pickup. I believe the carburetor has a egr port.

My question is: Which ports on this carburetor do I have to plug to run on my non egr/emission 350 v-8, manual tranny pickup.
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Old 12-31-2012, 07:46 PM
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Plug all the ports you do not use
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Old 01-01-2013, 01:37 AM
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Quote:
Originally Posted by joeysworld View Post
I have a 1975 gm quadrajet that Im trying to run on my 1972 c30 chevy pickup. I believe the carburetor has a egr port.

My question is: Which ports on this carburetor do I have to plug to run on my non egr/emission 350 v-8, manual tranny pickup.
In most cases the vacuum ports you'll need are a large front baseplate port for the PCV, the rear baseplate port (or a port in the intake manifold) for the PB booster, and manifold (aka "full-time") vacuum port(s) for the vacuum advance and the automatic transmission modulator. Any other ports get plugged.

Recurving a stock GM distributor will always help performance.
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Old 01-01-2013, 09:05 AM
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Originally Posted by cobalt327 View Post
In most cases the vacuum ports you'll need are a large front baseplate port for the PCV, the rear baseplate port (or a port in the intake manifold) for the PB booster, and manifold (aka "full-time") vacuum port(s) for the vacuum advance and the automatic transmission modulator. Any other ports get plugged.

Recurving a stock GM distributor will always help performance.
for the vac. advance on dist. you want to use a ported vac. one that applies vac. when you step on the throttle or else you will be running full advance at all times
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