a few friends and i (yes i have some!) were taking about this same subject a few months ago.it was split almost down the middle.i put both in the heads because that's where they were originally and it keeps the top of the intake much cleaner looking.
Temp gauge sender, better in the head or intake?
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factory temp gauge sender in my 81 malibu was in the stock position (in the head). i made a note of where the temp. was for years. installed a well known mechanical gauge and swapped it into the head and the factory set up was installed in the intake manifold. there was no difference in the readings for each gauge. i watch temps. pretty close all the time. mechanical gauge and factory temp gauge read the same in either position. i have heard that the head position was hotter than the intake position. did not read that way in my application, go figure.
The head may read a couple degrees warmer in coolant but much hotter on the surface than near the thermostat. My understanding is that it's just a more stable location at the head. Reading next to the thermostat might see more fluctuation on the gauge. Given the overall health of your cooling system, YMMV.
I would put in intake as I feel that is the hottest area. Right at the t-stat. last place the coolant is before it goes into the radiator
Sounds like we're splittin' short-n-curlies at this point. Manufacturers have done both, so it just doesn't matter.
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