Which thermostat housing ?

[Fredo]

I need to replace my thermostat housing on my 66 Mustang 289. I have noticed there are two types. One with a gasket or one with an o-ring. Which one would be the best?

 

[TOM B]

I like the o-ring style but remember to buy an extra o-ring.
If your manifold it pitted then go with the gasket and sealer.

 

[65notch]

either one will work fine. ive used both. i tend to like the gasket/sealer type better. a suggestion i have is not to get a cheap housing(crome plated type) from your local parts house. ive had troulbe with them not sealing and warping easily. use a good o'l cast iron one.

 

[streetgrande69]

gasket type.....i've had bad experiances with oring types plus you can get a new gasket anywhere.

http://store.summitracing.com/partd...592-A302&N=400070+4294872710+115&autoview=sku

and these
http://store.summitracing.com/partd...7401&N=4294908331+4294840125+115&autoview=sku

i like stainless fasteners on all my stuff, stops corrosion before it starts!

 

[Fredo]

Do the Chrome plated housings really leak more? I would really like chrome more than cast iron.

 

[rbohm]

the chrome plating tends to allow more leakage than a regular iron or aluminum housing does. i like the o ring type in theory, but in actual practice i prefer the gasket type, as it just flat works better.