Quote:
Originally Posted by 64speed
So what do you think it could be?
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Depends on what it is actually doing. If in neutral it idles and accelerates with a snap of the throttle lever, it should be fine going down the road carburetion wise. If it fusses and falls flat on its face when you snap the throttle lever quick to half or more throttle, then you are either not getting ignition advance or you have a lean out from not enough accelerator pump enrichment to match the throttle opening. Check your primary side accelerator pump lever and make sure there is no gap between it and the plunger attached to the throttle lever on the primary side. Take out any slack and verify that the accelerator pump squirts
through the shooters the moment the throttle plates begin to open. Take care not to over adjust and cause the accelerator pump to overtravel and tear the diaphragm. To check for over-travel, fully open the throttle to its stop (ignition off of course) and press down on the accelerator pump arm. You should have a minimum .020" clearance between the plunger and the arm tip at the bottom of its travel at full open throttle. On the secondary side, verify you have a working accelerator pump the same way using the secondary opening as your reference point just like the primary side.
Throw a timing light on the car and verify your advance is working on both vacuum and mechanical advance. Your vacuum advance hose should be connected to the passenger side fitting on the carburetor metering block. That is your ported advance and will keep your timing consistent even if your motor has a fluctuating vacuum signal typical of long duration camshafts. Some cars like full manifold vacuum for the advance but I've found the ported vacuum to work best.