Intake Manifold Issue
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Joined: Sep 2013
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Intake Manifold Issue
Took off my Holley 600 pfm carb to rebuild and find underneath the edelbrock spacer and the multiple layers of old gaskets a small peanut sized hole adjacent to the 4v holes. Its in the middle about an inch from either hole and on the passenger side of the manifold. Do i plug it, leave it half open(which is what happens when carb gasket and spacer are installed) or what? 
Hotshot
Joined: Apr 2009
Posts: 14,333
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From: Stanley, VA
That is where the EGR valve pulls the exhaust. There used to be a spacer that went between the carb and manifold, the EGR valve bolted on the back of it.
If you don't have the EGR spacer you'll need to seal the hole somehow.
If you don't have the EGR spacer you'll need to seal the hole somehow.
Logistics Pro
Joined: Feb 2000
Posts: 3,955
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From: Mesa
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