WoW haven't heard that in a while remember those days being at the shop full of smoke.Hell had fire dept show up couple times but it does work and will free lifters.Back in the 60's we used atf and water. Half and half in a coke bottle, raised the rpm up to 25-2,800 and poored the shaken mixture down the carb. Water turned to steam while the trans fluid lubricated. Caused the carbon build up to flake off the valves..But down side was it was like you set off a monster white smoke bomb behind the car.