What can you do to quiet noisy lifters in a flahead V8 cadillac engine?

1. Make sure it is the lifters and not loose wrist pins. 2. Check the camshaft for wear. When the lobes wear beyond the take-up tolerance of the hydraulic lifters, clicking is the result. Your favorite garage may have an instrument to check actual pushrod movement against what is called for by the published camshaft lift.