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The Winter 2005 issue of The Restorer will have a couple of articles on Holley restoration. They focus on four barrels, but much of the information will be applicable -- especially the one about checking the body for flatness. If you are a member, you should have that issue by the end of the month.
i had this problem on a 70 Z28. you have to take the float bowl off and put a straight edge on the metering block and on the body. mine was warped probable 1/8+". it is caused by over tightening the bowl screws and being hot. the solution was shown to me by a carb company. he has a flat aluminum plate hand sander that you stick on 80 grit sand paper. you have to totally disassemble the carb then clamp it in the vise and start flat board sanding that surface. you will be able to see the low spots as they wont show scratches till its all flat. my leak was on the accelerator pump feed thru. the older holleys didnt have a tube to transfer the fuel it was just a compression fit using the bowl and block gaskets. the same thing applies to the out board 2bbls. they dont have a metering block or pump but still have that hole. start with your middle carb and i bet its warped. its funny that i could get the car to run good but i could see fuel flowing thru a clear fuel filter i had at IDLE!! the exhaust pipes were wet inside from fuel. let me know if this fixes it.
regards dick
Another old trick for truing up carb surfaces is to take a piece of flat glass that is larger that the surface that you are trying to true up. Add a piece of sandpaper (I started off with 220 wet or dry) Place the paper face up on the glass. Slide your carb body, block, base, what ever over the paper a few times. The high spots will be shiney. If not warped too bad you can keep dressing the part down, finishing up with 400 paper and water. I have fixed numerous Holley's that way. Ain't fast and fancy but sure is cheap
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