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Coolant sensor thread size
#1
Does anyone know what the thread size is for the coolant temp sensor on the 351c block? I know the thread is NPT however not sure of the size. Reason I am asking is that I need a secondary sensor location to run the temp gauge and I am using the stock location for the efi system. This is what I am looking to put the secondary sensor:
http://www.summitracing.com/search?keyword=bci%2072065
It has a 3/8 inch bung and wondering if the OEM sensor is also 3/8 inch.
thx
-jbojo

-john
(jbojo)
351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,
C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

Some Mod pictures can be seen at:

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#2
BoJo,
It is 3/8" NPT.
Thanks, Jay
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#3
clevelandcoupe;157001 Wrote:BoJo,
It is 3/8" NPT.
Thanks, Jay

Thx Jay!!!
-jbojo

-john
(jbojo)
351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,
C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

Some Mod pictures can be seen at:

  Reply
#4
jbojo;156994 Wrote:Does anyone know what the thread size is for the coolant temp sensor on the 351c block? I know the thread is NPT however not sure of the size. Reason I am asking is that I need a secondary sensor location to run the temp gauge and I am using the stock location for the efi system. This is what I am looking to put the secondary sensor:
http://www.summitracing.com/search?keyword=bci%2072065
It has a 3/8 inch bung and wondering if the OEM sensor is also 3/8 inch.
thx
-jbojo

So this is what I got to add the second coolant sensor so that I could get my gauge working though it may not be as accurate if it were on the engine block. I am using that position to feed the EFI computer the engine temp and thought that would be more crucial for performance. I just need to connect this adapter to the return line on the radiator hose and I should have the temp that is in a ballpark range.
Thx again Jay for the response.
-jbojo


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-john
(jbojo)
351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,
C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

Some Mod pictures can be seen at:

  Reply
#5
On each side of a Cleveland block, there is a square headed, threaded plug into the coolant passages. I am not sure of the size, but I think it is 3/8ths as well and would allow you to pull temperature readings from the coolant in the block rather than in the hose, and thus be less affected by thermostat opening. Just a thought. It will sit well under headers or stock exhaust manifolds, I imagine

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#6
Guys,
Those square headed plugs in the side of the block that Jeff is referring to are coolant block drains and they are 1/4" NPT. You could very well use a reducing coupling & a nipple and fit the sensor in this location.
I guess my pipefitter background has it benefits.
Thanks, Jay
  Reply
#7
Thx for the inputs guys. BTW the EFI computer will be controlling the electric cooing fans so I am ok with the gauge being close though not 100% accurate.
-jbojo

-john
(jbojo)
351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,
C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

Some Mod pictures can be seen at:

  Reply
#8
If you put it in the return (lower) hose you'll be seeing the temperature after the coolant runs through and is cooled by the radiator. If you put it in either hose you won't get any temperature readings until the thermostat opens.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#9
jbojo;157230 Wrote:Thx for the inputs guys. BTW the EFI computer will be controlling the electric cooing fans so I am ok with the gauge being close though not 100% accurate.
-jbojo

What injection are you planning to use?

1971 Mustang fastback: 10.3:1 C90E 408W hydroller - CDAN4 EEC-V w/EDIS8, girdled, lowered and caged
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#10
Don C;157238 Wrote:If you put it in the return (lower) hose you'll be seeing the temperature after the coolant runs through and is cooled by the radiator. If you put it in either hose you won't get any temperature readings until the thermostat opens.

Yeah that was the issue I was having but decided to go with it in the return line. It will give me a general idea of the engine temp once the thermostat opens the first time. I didn't want to drill a larger hole in the block and tap it for a 3/8 inch NPT threads. The EFI sensor has a plug with 2 wires so I can't tap into that.

Mesozoic;157986 Wrote:
jbojo;157230 Wrote:Thx for the inputs guys. BTW the EFI computer will be controlling the electric cooing fans so I am ok with the gauge being close though not 100% accurate.
-jbojo

What injection are you planning to use?

Using MSD Atomic EFI system. Still looks like I have a carb on it this way.

-john
(jbojo)
351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,
C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

Some Mod pictures can be seen at:

  Reply
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