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Originally Posted by 68 P.O.S.
The usual suspects for Edelbrock carbs:
Float levels. Floats are normally off right out of the box due to shipping and handling. This causes flooding. Set float levels to Edelbrock specs of 7/16” float rise and 15/16” to 1” of float drop.
Fuel pressure. Excessive fuel pressure will also cause flooding. Edelbrock recommends fuel pressure be restricted to 5.5 psi.
Setting transition slots. Set transition slots in the main throttle bores to form a square. This ensures you’re idling only on the idle circuit and will help when transitioning from idle to acceleration. You can see the transition slots in the main throttle bores and will look like a rectangle when overexposed. You want to use your idle adjustment screw to get those little buggers back to square.
Accelerator pump. Set the accelerator pump to the middle adjustment hole. This is where Edelbrock normally suggests to set it at for mild builds, or where to start at when tuning. Also, ensure only 13/32” of the pump rod is exposed above the top of the carb plate.
Fuel percolation. This is notorious with Edelbrock carbs. With your setup, you shouldn’t need 2 spacers. You should only need the Edelbrock 9266 heat insulating gasket. It seals on its own and you don’t need any other gaskets with it.
Carb tuning. You’ll also want to buy the tuning kit for that carb to set it up correctly. How old is the carb? It may possibly need a rebuild too.
Timing. Increased timing helps the engine run more efficiently, and in turn, it will make the engine run cooler. What is your timing set at?
Connecting your vacuum advance to manifold vacuum will also help the engine run cooler at idle. You’ll have to set up the distributor for that as well.
For your HEI, are you using the original power wire? If so, you need to replace it with one meant for HEI in order to get the proper voltage to it. Do the dizzy and weights move freely? Also, what are your spark plugs gapped at? Standard gap for HEI is 0.045, unless otherwise specified by the HEI manufacturer.
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Hey, that was really good. Even though I have no percolation problem, I will be going over my carb.