scacer1
Member
Here is a pic of my car. I just built a 351c 4V factory iron heads with a Torker II manifold and a Holley 76750BL Ultra Double pumper carb. The carb is running too rich at idle to tune it. It is fouling plugs after about an hour of run time. I have ruled out vacuum leaks in the lifter valley and hoses. Tried tuning to increase the air bypass by opening up the secondaries with the screw on the base plate which helped but still not enough. I am pulling 13 inchs of vacuum at idle. This is a brand new carb right out of the box. The idle screws are turned out 3/4 of a turn tuned with a vacuum gauge, anything more than that and the vacuum and idle drops. I verified that the curb idle transfer slots are not open too far. I am at the point of drilling the butterflies but would prefer not to. I built this with a Howards cam and lifter kit part# MC230041-12. I don't think that this is such a radical cam profile that it should require drastic measures to tune it. I have never had a problem tuning Holley's before and I am at a stand still with this until I can get it figured out. Any help would be greatly appreciated. Thanks