Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Thin Metal plate between intake manifold and carb?
jbplanck:
--- Quote from: Ethan1 on June 19, 2013, 04:27:12 PM ---
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Not the same item as the one I need, thanks though. My piece is not flat on both sides, it is not a shim. The primary holes are punched through to create a flange on the bottom side. You can see it in one of my pictures above where I am holding the plate. It is very black as the Holley carb I removed was running too rich.
From what I have found about this plate the EGR system vented into the primary holes which are sunken in the intake manifold. They are sunken because the entire primary bore area was casted with a recess to accept the EGR gasses. However, this created some turbulence with the normal air flow from the carb. To counter this the plate has the primary flanges on the back side pressed out in a cylindrical press ( like a gromet) the same diameter as the missing ( hollowed out in cast to accept EGR vent) intake primary bore material in the manifold. This then restored the air flow eliminating the turbulence.
There is minor debate to how this might impact performance when removed. Most believe it is minimal or non relevant and can be removed. But still, I would like to replace it if possible.
Ethan1:
Here is another one:
http://quadrajetparts.com/rochester-quadrajet-parts-quadrajet-gaskets-seals-quadrajet-base-gaskets-quadrajet-stainless-steel-heat-shield-013-thick-p-375.html
jbplanck:
--- Quote from: Ethan1 on June 20, 2013, 03:15:29 PM --- Here is another one:
http://quadrajetparts.com/rochester-quadrajet-parts-quadrajet-gaskets-seals-quadrajet-base-gaskets-quadrajet-stainless-steel-heat-shield-013-thick-p-375.html
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Really appreciate your help, but that is not it, it is the same as the other one you posted. From the qjet parts website...
"Stainless steel metal shim (.013" thick) is used with a base gasket on some models with exhaust gases under the carburetor to avoid "burn thru". Stainless Steel heat shield goes directly under carburetor and above 'composition' base gasket."
Mine is not a heat shield. It goes between the intake manifold and base gasket. Notice above goes between the carb and base gasket.
Ethan1:
I kn.ow it is not the correct one. You said you were curious about the holley and mr. gasket one. This is the one Shark Racer was. referring to. Geez.
jbplanck:
--- Quote from: Ethan1 on June 20, 2013, 06:10:08 PM ---I kn.ow it is not the correct one. You said you were curious about the holley and mr. gasket one. This is the one Shark Racer was. referring to. Geez.
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My apologies Ethan, I didn't know that was directed to Shark Racer.
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