Holley 4160 Vacuum Secondary Not Opening

2 if adjusted o k check the vacuum opening operation as follows.
Holley 4160 vacuum secondary not opening. Only a smooth increase in power should be felt due to the fact that no two cars and no two carburetors are tuned exactly alike holley offers a kit under part number 20 13 that is designed to fine tune the secondary. Choke vacuum diaphragm unit is not adjusted to specifications or unit is defective. 1 adjust vacuum break to specification. Am i just over carbed.
Engine does not have enough fast idle speed when cold. This is the vacuum secondary venturi that air is drawn from by the downflow through the primaries to open the secondaries. You need to direct the air from. The video describes the various.
Holley offers some tips on how to properly operate and adjust four barrel carburetors with vacuum secondary throttle blades. Chevy 350 edlebrock rpm performer intake cam lift 440 460 duration 270 280 trick flow twisted wedge heads 63cc timing 15 initial total 36 degrees 700r4 tranny with 2300 stall 4 10 rear. Holley carb secondaries not opening. Imho holley still sells them new i just bought one read the following info on the 4160.
Vacuum for the diaphragm is supplied initially from one of. The point in engine rpm that the secondary throttle begins to open is determined by the load created by the spring. I ve replaced the diaphram using lightest spring cleaned vacuum passages. Look on the rear passenger side of the passenger side primary bore and you will see a very small opening.
Hi i can not get secondaries to open on my holley 4160 750 vacuum secondaries. Check and re set the fast idle setting and fast idle cam. Near the end of the article there s some discussion on vacuum secondaries that should answer most of your questions. If the opening rate of the vacuum operated secondaries is properly calibrated there should not be a kick in the pants.
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