Editing Holley 4150/4160 tuning

[[File:HLY METERBLK.jpg|300px]] ('''A''') Screw holes-<br> Four total, one in each corner used to fasten float bowl assembly/metering block to main body ('''B''') Idle downleg-<br> This passageway feeds fuel to both the idle discharge port and the idle transfer slot. ('''C''') Idle well-<br> Fuel from this well travels to the top of the metering block, then turns 180 degrees and mixes with air from the idle air bleed into the circuit. ('''D''') Accelerator pump passage-<br> This transfers fuel from the accelerator pump to the outlet nozzle. ('''E''') High-speed air bleed-<br> Air from the high-speed bleed enters the metering block here to be mixed with the fuel as it climbs the emulsion tube. ('''F''') Passage to booster-<br> This channel transfers fuel from the main well to the booster ('''G''') Ported vacuum passage-<br> This connects the ported vacuum source in the throttle body to the outlet where this can be routed to a source like vacuum advance. ('''H''') Parallel air well-<br> Air is introduced into the main well through these two holes. ('''I''') Main well-<br> Fuel collects here after passing through the main jet. ('''J''') Power valve port/channel restriction orifices-<br> This is where the power valve is located. The two small holes are the power valve channel restrictors (PVCR) that determine the amount of fuel added to the main metering circuit when the power valve opens. This valve determines when additional fuel is added to the main circuit. ('''K''') Idle restriction channel-<br> Fuel from the main circuit passes through this short channel and through a small brass restrictor (L) that acts as the idle circuit jet. ('''M''') Idle transfer slot discharge-<br> Idle fuel exits the metering block to deliver fuel to the transfer slot. ('''N''') Idle fuel discharge port-<br> Idle fuel exits the metering block and enters the carburetor main body for carb idle fuel below the throttle blades. ('''O''') Dowel pins-<br> Two pins locate the metering block on the carburetor main body.

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