Best Way to set the idle mix on a 4160

[Gaz64]

Originally Posted by steve meltzer

Patrick, an off idle question. 4160 on my '67 'Vette. Car starts great, runs great, idles great, but even a modestly brisk touch of the accelerator pedal and the car dies. So off idle response is zip. Correct squirter is a 26, I think. Moving to a 31 didn't help. can't recall the color of the cam, nor what is called for (it's a list 3180...and Holley tech couldn't tell me what cam was correct). I think the issue is the cam, but could this be a float issue or timing?
I need to confirm that the advance weights are moving, but the "pump shot" is good (even tried a new a/p diaphragm). Any thoughts? thanx. steve
(oh, yeah, my Cobra is still for sale).

Steve,

Perhaps your list number is a 3810 not 3180, since 3180 does not exist?

A list 3810 is a 585 cfm 4160, runs a 65 main, 25 pump, a purple sec spring, similar to the average list 1850 600 cfm with a 66 main, 25 pump, and plain sec spring.

Alas I can't tell you the cam yours should have, but most 600s come with a white cam.

Although this pic shows a red cam:

http://www.chicagocorvette.net/item....m=7232&rc=1437

And this one is also red:

https://www.ebay.com.au/itm/67-Corve...oAAMXQMTlRcPsX

So looks like Red could be correct, but run the smallest pump cam that gives throttle response with no flatspot. White is 17cc or 19.5cc, Red is 18.5cc or 20cc.

You could have some seizing advance weights.

Verify the float levels are correct, then a timing light on the balancer to check the advance is happening from say 1100 rpm up.

Gary