List 4345

[machyoung]

Just picked up a '69 Cobra with 428 CJ and factory correct Holley C90F-9510-H. List 4345. I can't seem to find this particular carb in the "Holley Numerical Listing" index. I guess what I'm most interested in is the stock vacuum secondary spring color (and other details given in the index). I could assume a plain spring, but... Any ideas? Thanks, Robert

[Gaz64]

C9OF-9510-H
Holley list 4345
735 CFM
Jets 66 · 79
Power Valve 65
Venturi Diameter. 1 3/8 · 1 3/8
Throttle Body 1 11/16 · 1 11/16
Metering Blocks 5673/5671

I can't find what the spring is though. This list has other carbs that you could compare to. One I looked up has a yellow spring.
http://www.mustangtek.com/4150/holley4150.html Gary

[machyoung]

Long time getting back to this. However, I'm finally getting back to this. What I've learned is that the engine has a "lean stumble" that appears to be due to ethanol laced gas (E10). Bone stock 428CJ in a '69 Cobra/automatic/3.00 gears. Stock squirter was a .029, which I changed to a .031. Better, however, still not right. Next I'm going to move the pump cam from hole #2 to #1. Should I jet up the primaries? Secondaries?

Does anybody have a definitive guide or instructions to tune specifically for a 4150/4160 Holley running E10? I keep seeing info about squirter size, jetting even float level increases?

[Gaz64]

What color pump cam is on there now?
Position #1 is more suited to near stock engines, Position #2 delays the cam and provides slightly more total volume.
If you chasing an off-idle stumble, try Position #1. Gary

[machyoung]

Odd. The cam that's on there is a white cam. However, when I match it up to the cam kit that I have, the profile doesn't match the white cam, but it does match the pink cam. I believe the cams to be very similar. I'll move the existing cam to the #1 position and test. Thanks, Robert

[Gaz64]

It's unlikely. The pink is a 3 hole 30cc cam. The white is a 2 hole 17/19.5cc cam. If you have the whole cam kit, placing them all side by side, might show some similarities, but there are some vast differences. Gary