OK to put temp senor in waterpump bypass line?

[Apex_speed]

Originally Posted by Dumpling

Isn't there a gauge package for the Holley efi? Can't you mount that or wire in from the feed for the package?

I wish. It can run the Holley gauge packs which use a single data wire and there is no converter that I'm aware of to feed analog gauges. I'm not about to give up my Smiths gauges for Holley gauges.

[Dumpling]

I'm sorry, but why can't you simply weld on a new mount?

[Dwight]

I needed a second water temp for my fuel injected (Eight Stack) system on my 302.
I drilled and tapped a second hole in the intake just behind the thermostat.

Dwight

[Gaz64]

Originally Posted by Dwight

I needed a second water temp for my fuel injected (Eight Stack) system on my 302.
I drilled and tapped a second hole in the intake just behind the thermostat.

Dwight

This is the best option.

I've done this more than once.

The OP needs to find a location on the front of the intake, engine side of the thermostat.

[Apex_speed]

Ok, I think my problem is solved thanks to Craig's Cobras.

In the second diagram in the link below he shows alternate plumbing for the water pump bypass hose and heater. If I switch over to this, I should be able to put an inline tee fitting for the EFI's CTS in the now lengthen bypass line up be the manifold and have engine temp coolant flowing past it all the time.

I'm headed this route over drill a tap of my manifold unless anyone sees issues with it. There is just not much room on my manifold around the MSD distributor and the other sensors so it would turn out like a bit of a cluster.

Aluminum Head Thread Repair

[Apex_speed]

I came up with a better solution for the Roush 427R. There is an aluminum spacer block that holds t-stat housing 2" off the front of the motor. I am drilling and tapping that and putting a small weep hole in the t-stat.

[brad-cam]

Waking up this thread to ask as related question I have. I have a 347 with Edelbrock AirGap manifold and Holley Sniper. Temp gauge sender is on right (passenger) side coolant port, no heater loop connected. Sniper EFI coolant sensor is on left (drivers) side coolant port. At idle both the gauge and Holley CTS are reading the same temp, however when driving on a 60 degree day, the Holley CTS runs about 20 degrees cooler than the gauge. I have a 180 degree thermostat. The gauge moves between 180-190, but the Holley CTS reads 150-152 (which means not warm enough to activate learn mode).

Could this be because of airflow through the cylinder 5 intake runner and it's proximity to the coolant sensor port? Or proximity to the cool coolant coming back from the radiator?

I'm going to swap the sensors side-to-side to see if the Holley CTS goes up to 180.

I just replaced the CTS with a new GM one after dealing with the well known "bad CTS" issue with the Holley-supplied one.

Thank you in advance for any guidance you have !!

[spdbrake]

You can switch your thermostat housing to one that will accept a temp sensor.
90deg type:
Boss is there but you'll need to tap it for NPT.
https://www.summitracing.com/parts/f...-m90/make/ford

Ready to go.
https://www.summitracing.com/parts/mrg-9713/make/ford
https://www.summitracing.com/parts/r...1003/make/ford
https://www.summitracing.com/parts/sum-370980/make/ford
https://www.summitracing.com/parts/s...92-b/make/ford
45deg type:
https://www.summitracing.com/parts/r...1001/make/ford

[brad-cam]

Thanks, I might go that route. I need the 45deg type. I also don't have the coolant bypass connected (port on thermo housing is plugged), just the pin valve in the thermostat. I plan to add the bypass hose to the water pump port (as OEM). That might be unrelated to the side-to-side temp imbalance I am seeing, but I think it should be there.