1987CamaroZ28

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!

This ad is not displayed to registered members. Register your free account today and become a member on ThirdGen!

__________________
1987 Z28 Iroc-Z; a/c delete, removed heater core to clean up engine comp, k member, control arms, Hotchkiss Front/rear sways, front coil over koni kit, Spohn reinforced strut plate, stainless brake lines, Spohn torque arm, wilwood front brake set, metco LCAs, panhard rod, definned MAF, AFPR, MSD 6al, TES 1 5/8, Random Tech cat, flowmaster, gutted air filter housings, T/A alum rear girdle cover, and a bunch of other stuff i can't remember.

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.

1987CamaroZ28

Thanks very much. I brought the sensor to the local hardware store and it was confirmed to be 3/8 NPT.

Thanks again

88TPI406GTA

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.

__________________
Adam
-on hiatus- 88 GTA- 406/700R4, HSR, Pro 220cc alum heads-Griffin- Victor Jr. WP
-91 RS/Z28 - 350 TPI, T-5, 3.73 posi, DFI to 730 swap, SLP CAI/Full Exh, etc

dimented24x7

Yep, just need a bushing. 3/8 to 1/2 NPT. Sold at just about every major hardware store (home depot, Lowes, etc.).

1987CamaroZ28

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