Lazy Throttle

[427yenko]

One more thing. I currently have a 31 squirter and the blue cam for the accelerator pump circuit. 30cc pump. I know that 28 is regarded as the typical squirter to use. I am of the thinking that a higher number squirter will limit the amount of time the shot moves through the cycle, But I have even gotten decent results with a 21 squirter. It just seems to have a small initial void with that and the 25. I have found that backing out the adjusting screw to limit the amount of fuel the pump can deliver has made some strides. I have been careful to be sure there is still 15 thousandths extra travel on the lever. I have also run the white cam with similar results. Always in the number one position. There are conflicting reports on the accuracy of the Holley pump cam charts particularly of the blue cam. I have seen the blue cam charted in two totally opposite curves.
It just seems to me to be a heat related issue. The car is not running hot, though.

[napa68]

If your combination is as stock as you indicate, I don't feel scrutinizing the crossover is necessary.

I admire your attention to detail with accelerator pump nozzle and cams, but don't know that is the root of your problem.

Have you had other 302's? IMO, their torque and consequently throttle response is not overwhelming.

You appear to be on top of the detail work. Having said that, soliciting a seasoned pro such as Eric Jackson would be in order. Eric has found more than his fair share of issues and smoking guns in a carb (and can rectify it). So many times the ignition side hold the problem and the carb gets the blame. Hence, my questioning about the ignition side.

[67since67]

Originally Posted by napa68

So many times the ignition side hold the problem and the carb gets the blame. Hence, my questioning about the ignition side.

There's a saying amongst old mechanics. "80% of carburetor problems are electrical"...

[Too Many Projects]

How are the points ? High quality ?
Gapped correctly ? Too narrow of a gap (high dwell reading) will cause a weak spark and affect low rpm performance.

Divorced condenser or the all in one set ? Back in the day the all in 1 were not reliable. No clue what is even a high quality set of points anymore. Since I am not in the league of judging my stuff, I have Pertronix conversions in all my cars.

[juliosz]

Is the heat shield on your intake intact? Also, don’t know if anyone else mentioned that the ignition coil could be breaking down when hot. A friend of mine chased a similar problem at the pure stock races a couple years ago and it ended up being the coil.