What determines when an aftermarket cam requires a higher stall. They say a 224/114 is pushing the limits of a stock converter. What limits? Can a stock converter cause idle problems with an aftermarket cam?

 

The stock cam is too big for a stock stall. Peak TQ is over 4000 rpm and a stock stall is about 1800 rpm. That's way too low. Running a stock stall just kills you off the line and on the upshifts.

Most people use an 800 - 850 idle with a 224 cam. An idle speed of 750+ on a stock converter is about when you will start feeling it fight the brakes coming to a stop.

 

I drove around on a stock stall with a 226/234 cam and an 900 RPM idle and I was fighting to stop the car. I had to have the brake pedal practically mashed to the floor to keep the car stoped, and it would slam into gear when shifting into D from R or P