1978 Temp Sensor Thread Size?

[DO2G]

Can anyone tell me the thread size for the temp sensor in a 78? I need to get a new hole drilled and tapped in some new heads.

 

[larrywalk]

The thread size is 1/2" NPT.

 

[larrywalk]

What kind of new heads?

If they have the smaller hole for a later temp sender, there may not be enough relief to accomodate a stock sender. Alternately, the stock sender can be installed into the intake manifold near the thermostat housing like was done previously.

 

[DO2G]

What kind of new heads?

If they have the smaller hole for a later temp sender, there may not be enough relief to accomodate a stock sender. Alternately, the stock sender can be installed into the intake manifold near the thermostat housing like was done previously.

Brodix IK180. I didn't want a wire running to front of the engine, so i wiould rather keep it out of sight.

 

[Red]

You don't say what head you are using, I assume it has the smaller sender hole. The after market has senders for the smaller size hole. It would seem economically feasible to use a smaller sender, if that works for you.
3.8ths NPT
Be Cool
http://www.jegs.com/i/Be+Cool+Radiators/134/75029/10002/-1

Edelbrock, doesn't mention the temp
http://www.jegs.com/i/Edelbrock/350/36012/10002/-1

Sunpro
http://www.jegs.com/i/Sunpro/885/CP7576/10002/-1

 

[DO2G]

Was using the stock the L-82 head.....Upgrading to the Brodix IK180.