carb issues

[rwhite65]

Ok, I posted on this last fall, and I am just now getting around to trying to fix this problem.

Long story short, when I put the new cam, heads, and 1.7 roller rockers in the car, I developed what I thought was a vibration at low rpms. It was noticeable right off of idle (leaving a stop sign, it would “stumble”) or at cruising speeds at only a slight throttle off idle (like in overdrive). As soon as I give it throttle, past that very slight point, the vibration would go away. It almost felt like a chug at cruising speeds, but it is definitely not a balancing issue.

Jester suggested a long time ago I change the accelerator pump squirter to one size bigger. I had a few respected local guys tell me to change the accelerator pump cam, one going as far as to say change it 2 sizes up.

My carb had the white cam on it, which is stock according to the Holley website. I changed it out tonight to the red, which is two up from the white, and one over the blue (next over stock).

This change definitely did not make it better, it is definitely worse. Now when cruising I can get the throttle actually caught in a sluggish bog and unless I give it more throttle, it just makes the car shake like something is out of balance.

Should I change the squirter? What else could it be? The floats should be set just fine, and the timing SHOULD be good, but I will check it when I can get a vacuum gage.

I need to just go buy a Holley book and see what I can figure out.

Ryan