Thread: What causes low rpm hesitation?

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Yep, do you suppose that because of the higher manifold, it is cutting down the air/fuel mixture under initial accelleration? Also someone mentioned that maybe lighter advance springs. I'm still leaning toward carboration being the culpret. Tell me, the pipes are soot black, smells very rich when idling but acts like it is running out of gas when you first put your foot to her. I have yet to stomp on it, it would just die I am pretty sure.

If your tailpipes are that black you are running too rich. Makes me think that the primary jets are too big and/or the metering rods are too small. The lighter springs will cause the vacumn advance to come in sooner and with the weight of your car that's not necessarily a good thing. What size is the carb and what size are the primary jets? Much over 600cfm and you're over carbed. Are you coming to the Nats on Friday or Saturday?

The carb is a 1405 (600) and I could not tell you what size the jets are. The hesitation is in the accelleration part of the carb I think. It does it when I press on the trottle no matter what speed I am going. Yes I will be there on friday for the whole weekend, I can show it to you then and see what you think.