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Trick Flow Coolant Tempurate Sensor (CTS) question

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Old Jul 24, 2009 | 12:54 PM
  #1  
1987CamaroZ28's Avatar
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Car: 1987 IrocZ
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Trick Flow Coolant Tempurate Sensor (CTS) question

I have an 87 TPI 305 engine, that now sports Trick Flow 175cc aluminum heads. The Trick Flow heads have larger than stock Coolant Temp Sensor threads. Trick Flow said their Coolant Thread Sensor provisions are 1/2" x 14 NPT. Does anyone know what the stock coolant NPT thread size is? I need to get thread inserts to use the sensors.

Any help is appreciated!
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Old Jul 24, 2009 | 03:07 PM
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Damon's Avatar
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Re: Trick Flow Coolant Tempurate Sensor (CTS) question

GM used 2 different sizes over the years. Lots of older stuff is 1/2" NPT, sounds like yours are the smaller 3/8" NPT size, though.
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Old Jul 26, 2009 | 09:36 PM
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1987CamaroZ28's Avatar
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From: Connecticut
Car: 1987 IrocZ
Engine: lb9
Transmission: 5 spd
Axle/Gears: factory 9 bolt with 3.45 gears
Re: Trick Flow Coolant Tempurate Sensor (CTS) question

Originally Posted by Damon
GM used 2 different sizes over the years. Lots of older stuff is 1/2" NPT, sounds like yours are the smaller 3/8" NPT size, though.
Thanks very much. I brought the sensor to the local hardware store and it was confirmed to be 3/8 NPT.

Thanks again
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Old Jul 27, 2009 | 12:22 AM
  #4  
88TPI406GTA's Avatar
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From: MN
Car: 2009 Pontiac G8 GXP
Engine: LS3
Transmission: 6L80E
Axle/Gears: 3.27
Re: Trick Flow Coolant Tempurate Sensor (CTS) question

You should be able to get an adaptor to use your CTS with the larger threads in the head.

I was able to do this when I did my 400SB swap years ago.
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Old Jul 27, 2009 | 03:32 AM
  #5  
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Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Re: Trick Flow Coolant Tempurate Sensor (CTS) question

Yep, just need a bushing. 3/8 to 1/2 NPT. Sold at just about every major hardware store (home depot, Lowes, etc.).
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Old Jul 27, 2009 | 09:49 AM
  #6  
1987CamaroZ28's Avatar
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From: Connecticut
Car: 1987 IrocZ
Engine: lb9
Transmission: 5 spd
Axle/Gears: factory 9 bolt with 3.45 gears
Re: Trick Flow Coolant Tempurate Sensor (CTS) question

Originally Posted by dimented24x7
Yep, just need a bushing. 3/8 to 1/2 NPT. Sold at just about every major hardware store (home depot, Lowes, etc.).
I'm going with this bushing reducer from Jegs, since I'm in the process of getting other parts.

http://www.jegs.com/i/JEGS/555/100465/10002/-1
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