C2: L36 carb adjustment tips

[Dan Pepper]

I've been working on dialing in the stock carb on my '66 L36. It's an original professionally rebuilt list 3606 Holly for a A.I.R. 427.

I adjusted per the manual, and the car tended to run a bit lean (the car bogged on take-off), and the residue in the tailpipe was a very light grey.

I turned both mixture screws another 1/2 turn out and she runs much better, but the residue the the tail pipes are different from right to left: the left bank leaves a little bit more of a gray/tan residue, while the right bank leaves the same very light grey residue.

I would think that both screws should match the same lean/rich mixture by turning the same amount. Should I adjust by tailpipe residue, or always adjust the screws the exact same amount?

[John H.]

Re: C2: L36 carb adjustment tips

The customary method for adjusting idle mixture is to use a vacuum gauge connected to full manifold vacuum and adjust for highest steady vacuum; remember that all you're adjusting is idle mixture - air/fuel ratio any other time is a function of the main metering system (jets and power valve)