On my 32 3W and the 32 roadster ( both with ZZ430 engines ) I use a Gates #20225 on the lower and a Gates # 20046 on the upper.



On the #20025 ... I have to shorten it up some and the end theat goes into the Walker Radiator has a reducer sleeve ( available from Gates ) . I do not have its number but any decent parts counter man most likely has it.

On the #20046 ... my thermostat housing goes straight up ...



It is a Everco #W-24931 but a 1985 Chevy van with a 305 will work also.



I have a screw in temperature gauge in the fitting on the thermostat housing since this photo