proform secondary guidance
I'll pull the carb and check the t port. I'm pretty sure I set it square and adjusted the secondaries for idle. I'll also adjust the rear jets down.
With that cam you will need a lil more Transfer exposure, probably a little taller than wide.
The thing about the transfers at idle is; that you are trading mixture screw adjustment for transfer fuel. If you get too far up the transfers, then your mixture screws will need to be dried up. If you are too far down, then your mixture screws will have to be opened up to compensate. This low-speed circuit never stops working as long as air is moving thru the bores. So around 2200 with that cam, your vacuum will peak. You can set your mixture screws there, somewhere in their range, for best AFR. Then reduce the idle speed and set the Transfer slot exposure for best quality idle. Now you got both ends covered. If the idle speed is not right, set it with idle-timing and idle air bypass. If you change the idle air bypass, then it's back to 2200 and repeat.
I wouldn't pay too much attention to the AFR below the rpm of peak vacuum; cuz there is so much crap going on in the intake with that cam, I doubt you'll ever get it right. As long as you don't have tip-in problems, she's good to go;
Like YR says;
Also, don't live and die by that O2 sensor. You can get a lean spot and not hurt anything. I trust plug readings over the O2 for most things, until you are down to the gnats *** for tuning.
IMO,
the biggest error I see Streeters do, is trying to run a lot of idle timing. Yeah sure that wakes her up, but with a 2800TC there is no good reason for that, cuz she's never gonna be asked to pull from idle to 2800, so why make life hard. Remember, at idle, with the intake full of reversion, she might like 30 plus degrees of timing If you had a 1600rpm TC locking the engine in there to 20mph, yeah, lots of timing would be a good thing. But with 4.10s and a 2800, you just step on it a lil harder and torque thru it.
IMO, the T-slot to mixture screw adjustment sync. takes precedence over idle-timing.
