2 barrel carb vs 4....

[azfordman]

Trying to dial in my carb is just one of the things I have been working on to get the car running at it's best. I have been swapping jets and getting the float bowls adjusted. About a week ago I did the paper clip test on the secondaries and came to realize they were not kicking in until I got up to the 5000+ RPM range....not very practical for street driving! For all intents and purposes the car has been running on only the primaries....basically a 2 barrel carb. Picked up a Holley spring kit and quick change adapter. Worked my way down to the lowest (white) spring and still no change. In fact, I could not get the secondaries to kick in at all! Before I got too frustrated I decided to go back to square one and pull the secondary vacuum advance off and see if I had installed something wrong.....found the rubber diaphragm had a tiny tear where one of the bolts had caught and twisted it!!! I replaced the diaphragm much more carefully this time. I currently have the long yellow spring in, and may step down to the short yellow, but I gotta tell you....what a difference!!!!! With the secondaries kicking in at a lower RPM the car is actually staring to get scary fast!!!! Once I get the timing nailed down I will be in great shape!