One temp gauge reads higher than the other - both in intake.

450bench

Veteran Member
Feb 25, 2002
3,644
memphis, tn-shelby
I’ve got 2 temp gauges on my car. One in the back of the intake and one in the front. Front reads 10-15 degrees cooler than the other. Wtf ? Any ideas?
 

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1980RS

Veteran Member
Jun 17, 2006
6,263
MN
That's pretty much normal on a gen IV BBC. Gm fixed that with the gen V and gen VI blocks and heads.
 

ZZ430

Veteran Member
Jul 9, 2004
687
Crockett, Texas
That's the Air-Gap manifold right?

I tried using a gauge on the front and a sensor for electric fans in that rear port. It didn't work. It's the manifold design. Looking at the port it sure looked like it would. It would be interesting to try switching them for a test.



I'm thinking yours is the same.
 
Last edited:

76z28

Veteran Member
Jun 29, 2009
2,588
bakersfield
Water is pretty stagnant at that port in the back(it isn't flowing like it is in the front). I think they put those ports in the rear for a cross over to alleviate that "issue"
 

mallard

Veteran Member
Oct 3, 2013
1,880
SK, Canada
If the sending units are the same thread size you could switch the units to see if the gauge readings change. If they do not either the gauges are faulty (I would think it’s unlikely that both would be defective at the same time) or you truly have two different operating temps. Now whether that’s a thing or not will depend on if you have any other symptoms going on. I’m guessing not.
 




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