9in drum brakes

On what car with what engine, transmission and rear axle combination? 9" drums can stop GOOD in light cars like A bodies with slant 6 or stock 318 power. Beyond that, you may find yourself needing to plan stops with some extra room. I have 9" drums all around on my slant 6 64 2 door Valiant. Even though the engine is a pretty hot slant 6, it still stops very well. I rebuilt the brakes system from the ground up with all new hardware, shoes and rebuilt factory wheel cylinders. It stops VERY well given what it has. I also have a set of Kelsey Hayes front disc brakes waiting to be swapped on.