Six Pack issues and rebuilding by tommyg29

3 minute(s) of a 193 minute read

Still hunting...the idle, that is.

Video (click on first picture) shows it hunting from 1500 rpm or so to stumble speed and back and forth. 

Brake booster is not a problem.

Thanks for all the replies, especially CP. I know you have told me at least twice in this thread to use 61-62 primary jet, but heres my setup:

Jets- 66 primary, 80 secondaries

6.5PV (I think)

31 squirter

Approx. 6.5 psi fuel pressure

290 cam in position 1

MSD timing 16/36 (more or less)

Cam: Crane hydraulic 302

Getting about 10 inches vacuum at 1000 rpm and 20-21 at cruising speed

Vacuum drops to 5-6 inches at anything in the 700-800 rpm range

From the pictures you can see I just drilled out the primary blades with a 3/32 bit and made sure the transition slot is at a reasonable position. It does seem to be running slightly better since then, but consistent problems remain.

Btw, what is that other small horizontal slot (near the transition slot) in the one barrel for?

I have come a long way. It isnt smoking anymore, and Im getting close thanks to many hours of fiddling with every adjustment screw but I will be happy with a STEADY idle at 1000 if I can manage it.

Oh, and if I can figure why after about 10 minutes of running/idling it just quits out of nowhere. It happened once in an intersection and wouldnt restart for about 5 minutes   but it does it consistently, even just sitting in my driveway.

And still, hard starting. With the choke removed, it takes a while to warm it up, and I dont even think to try and expect it to idle half way normal if it isnt warmed up at least 5 minutes.

In summary, 3 main problems:

- hunts at warmed up idle

- quits after 10 minutes running

- hard starting

http://s992.photobucket.com/user/trgreen/media/Plymouth/Cuda%20six%20pack/IMG_4080.mp4.html