Anyone know what that coolant passage on the front of the HSR below and to the side of the thermostat housing is for?
i was thinking it was for a heater hose and was going to plug it, but I figured I had better check.

 

Looks like heater hose. The other side going from the top down is for the cts.
Is this on a vette ?

 

Yeah. It's on a Vette. I bought that intake off a member here like 3 years ago.

This forum is way friendlier to HSR questions

 

Just curious does your hood close ?

 

What is cts?

Nope, have to cut it.

 

Coolant temp sensor, looks like you have two holes on the passengers side. I’d put the cts going straight down and the coolant hose in the front.

 

First I will have to find or buy a cts and then figure out where the plug to it is hiding...

I didn't start this swap, and it's been a real pain figureing out the little details.

 

The cts wires are yellow and black. It’s the same sensor that’s under the plenum the intake air temp sensor.
https://www.rockauto.com/en/catalog/...+/+sensor,4748
The intake air temps sensor should be tan and black. You will have a single lead left over from the egr temp sensor. You should have a chip programmed other wise I would expect a egr code 32.

 

One of these three?

 

Those were for the air pump diverter valve.