Subject is a '70 Corvette - Upon swapping the Holley 600cfm vac. secondary for a 750 cfm mech. atop a Edelbrock Performer RPM, the vacuum fitting (from the original L-46 manifold)that supplied the PB and vacuum-powered doors, etc. no longer cleared the new carb. (Secondary fuel bowl extends farther rearward). I'm already using a 1/4" insulated gasket. I've plugged that manifold souce and taken vac. for the PB and vacuum motors off the large nipple at the rear of the carb base (below throttle blades). I've also routed the PCV valve to a small nipple at the right front corner of carb base(again below the throttle blade), but am not sure if this will provide enough flow for PCV system and if this source will cause some unbalance in the idle mixture on the primary side.
Now the question(s) is/are: 1.) would I be better off using the single larger vac. fitting at the base of the secondaries for all three (PB, vacuum motors, AND PCV) or 2.) shall I try to locate or make a low-profile manifold fitting and use it for PB and vac. motors (as original) and use the large carb base fitting (at rear) for PCV only or 3.)I'm OK as configured? Thanks.
Now the question(s) is/are: 1.) would I be better off using the single larger vac. fitting at the base of the secondaries for all three (PB, vacuum motors, AND PCV) or 2.) shall I try to locate or make a low-profile manifold fitting and use it for PB and vac. motors (as original) and use the large carb base fitting (at rear) for PCV only or 3.)I'm OK as configured? Thanks.
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