I used the wiper tank on my hemi cuda and it works great. No one even knows it's being used for the overflow. The trick is you put the overflow hose on the bottom but you MUST drill an air hole in the the back of the wiper tank otherwise it will air lock. I drilled a 1/4 hole in the rear corner where it's under the hood pin mount so you can't tell it's there. No problems in 5 years of use even in 100 degree weather. You only need about 2" of coolant in the tank when cold and mine's about 3/4 full hot. Has never blown top off or overflowed. Good luck. Mike