Who makes the best vacuum contolled heater valve?

The heater valve in my car has started leaking. What application is the best choice for a new valve?

I use the metal 928 one. Works great.

https://www.pelicanparts.com/More_Info/928MHEATRVLV.htm?pn=928M-HEATRVLV&gad_source=1&gclid=CjwKCAiAqY6tBhAtEiwAHeRopZiC0oen9i-mB0E0zXygmCKPH999HHYmFhN2-a86MLulmeRyehqMcBoC7eUQAvD_BwE

How did you plumb that style valve? The valve I have has four connections so that when the valve is not in the heat position, the heater circuit bypasses back to the engine.

The valve closes and blocks the flow to the heater core when vacuum is present. When vacuum is removed, the valve opens and coolant flows through the heater core. This is just how the '85.5+ 944s were originally.

Mine is an old LT1:

The LS engine doesnt have a separate cooling system bypass hose. gm vehicles have coolant flowing through the heater core all the time and use a blend door in the heater box to control heat. as a result, gm engineers decided to use the heater core as the bypass circuit in the cooling system.

if you use a simple on/off coolant valve it will cause an LS to run hot when you turn the heat off because there is no coolant flow through the motor. a 4 port valve always allows coolant to flow, it just bypasses the heater when its shut off.

i use an off the shelf valve for a chevy pickup, somewhere in the 90s. no idea the brand.

Thank you for your replies. I dug a little deeper and found that a heater valve from a pickup in the late '90's with an LS engine will fit. I got one at NAPA.

Thanks Raymond. The new valve from NAPA is in the car and not leaking.