I cant remember what brand or temperature of thermostate I last bought.I do remember that it was a High flow.I paid a couple bucks extra for it .I had mine out and dropped it so just to be on the safe side I think I will get a new one.Its for a 455 Any recommendations

 

I just put in a Gates 180º Superstat last week!

Works perfect so far!

Greetings
---
Andi

 

I like the Stant Superstats.

 

These brass-colored hi-flow designs came under several different brand names - Gates, Robertshaw, Mr gasket and a few more. I have had them all and they are most likely the same product.
Just test it on the stove in hot water, as I have had one stuck open brand new.

 

Any recommendations?

Sure:
Keep better records
Put the package part with the PN/ Temp info in the glovebox or the car's paperwork folder

 

Just buy a regular one with a 180 degrees and drill an 1/8 in hole in it so if it sticks closed it will still pass some water, I do it to ever stat I buy.

 

As above.

I suspect the high flow models are all the same part made by the same company, as they appear identical.

I like the high flow thermostats, as they are like the ones installed at the factory.
I can see how drilling a hole might work (especially if you don't drive in sub-freezing weather), but for my money, it's less trouble to pay the extra couple of bucks over the "regular" price.

If you have a "regular compression" motor, I'd be inclined to go for the 195° 'stat, but if you've got a high compression motor, I feel like I can avoid a small amount of detonation risk by running it at 180°, and still have it running in its specified operating range.

- Eric

 

Are you saying these were factory installed in our old cars from the factory?

 

Thanks for everyones input. I purchased a 180 High Flow Milodon.Say I need to drill a 1/8 th hole in it.Sounds like a good idea in case it get stuck.

 

Wellllll... It kind of does to me, but really it doesn't look that much like the original or the "normal" aftermarket one:

Original:






Regular Stant Thermostat:



- Eric

 

I really don't think I have ever seen one like in the Gm box.
I just use the one at the bottom of the pic and drill two holes in it.
The one I have now is the one I posted a pic of so i'll give it a try.

 

You have a bypass. Why would you drill holes in it?

 

I was thinking the same thing Trip. Also how much water will flow through an 1/8th hole?

 

No, this one is the high-flow design that I was mentioning in the post below.
They work well, but test before using to make sure it is not bad out of the package.

 

The reason I drill a small hole in the stat is to prevent an airlock situation from developing when filling an empty cooling system. The 1/8 inch hole will let the trapped air out through the closed thermostat into the radiator when filling the cooling system, thus there's no need to wait for the big burp when the stat finally opens and lets the trapped air out and then having to add more coolant.