Simple question Chris . Have you ever heard of this part and if so do you have a thoughts ? This supposedly is used on the P400 in the H1 . You have posted on plenty of the P400 engines and I thought you might know about it . The interesting point is that this is a dual thermostat but it exits...
Leave it alone . Tape it and forget about . The new number is 23504005 . The Diesel Place has a few threads on it . Basically GM found out that they needed glows even when warm . That was a switch and then just a shunt . My 86 has it but yours being a 91 may be different .
Um , where's the return line ? There should be a hose instead of a cap in the last photo . Goes across the front of the heads and connects to the injection pump , both sets of injectors and then to the return line on the frame .
No photos but I have a couple of these from engines that were parted . I also have 2 complete engines that I can check for the correct parts . You will need the plate for the waterpump which I have . If you really want all of this , just pay for shipping asI can't see me using them . I'm in Md...