351M stock intake cooling diagram?

[Tony.Gamblin]

i'm installing a temperature gauge on my truck. i know, not real difficult. however here is the tricky part. im wanting to install this and keep my eletronic gauge working in the cluster. now i know that the logical way to do this is to run the gauge into a seperate cooling port on the intake but im not real familiar with 351's yet. what im looking for is a diagram of a stock 351m intake manifold so i can see where the water jackets run and decide that way where i want to run my temp gauge. anyone ever seen one or know where i can look? i googled the hell outta it, every which way i could think but couldn't find anything. thanks in advance guys.

P.S. if you can tell me a way to run my manual gauge AND eletronic gauge out of the same water jacket port that will work too!

[redmt79]

Well the 335 series engines have a 'dry' intake manifold, meaning that no coolant flows through it.

The best place to hook a gauge is at the factory sending unit location on the front of the block below the water neck (next to the water pump). You could also install a sending unit in one of the threaded holes in the water neck if you no longer are using the PVS switches. There may also be an extra threaded port in the water pump, but I can't recall off the top of my head.

[Tony.Gamblin]

thanks for the reply. im assuming that by waterneck you mean thermostat housing? i thought about installing it there, however if i was to do that, woudlnt i get the temperature from the radiator instead of the temperature inside of the engine which is what im interested in?

[redmt79]

More or less, the down side to installing one in the thermostat housing (waterneck) is that you probably won't get a reliable reading until the thermostat opens and coolant starts to flow past the sending unit. You could try it and see what kind of results you get.

If you install a sending unit in the extra port in the water pump (should be on the left-hand side of the pump as you are looking at the engine), it will likely read cooler than the stock gauge as it will be immersed in cooler water being pumped from the radiator.

Also, my gut feeling tells me that you shouldn't use a Tee arrangement because the senders should be immersed in flowing water to get accurate readings.