[lennyB]

As I assemble my 100 % stock 1968 J-Code 302 with Automatic Coupe, I noticed NPD has different temperature thermostats available. What would be the correct temp rating to buy for the above vehicle? Looks like they offer 160, 180 and 195 degrees.

Thanks

 

[BW66]

I used a Stant 185 you can get it at a local parts store.

 

[kenash]

IMHO, If your other cooling components are in top shape, a 195º will work fine. The higher operating temps will reduce the formation of acids and "gunk" internally. You'll have a cleaner engine for it.

 

[zray]

your Mustang left the Factory with a 192 / 195 F thermostat. If your engine and cooling system are in good condition you should have no problem using the 195 F thermostat. Anything cooler than that will not let the engine warm up as fast, contributing to sludge forming in the oil. Sludge is a poor lubricant.

The Ford engineers knew what they were doing, don't try to outsmart them by using a different thermostat.

Z