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Because our carb is missing the choke assembly, we can move on to tearing down the bowls and metering blocks. If you have a choke assembly, remove the little clip from the linkage rod and remove the three screws holding the assembly on. There is only one power valve on the non-Dominator-style carbs like this one. It is in the primary metering block and requires a 1-inch wrench to get it out. Pull the jets out of the metering blocks and give them a good soaking with the carb cleaner. Keep track of what jets were in what metering block, but if you forget the smaller numbered jets go in the primary metering block. Also compare the old power valve with the new one making sure they have the same numbers stamped on them. Ours had a six and a five stamped on it, letting us know these will open at 6.5 inches-Hg. The rule of thumb is to have a power valve that is marked with half the amount of the engines vacuum at idle and 6.5 is good for most stock small-blocks.