i'm looking for an aftermarket thermostat housing, the billet type with an O-ring seal.
upon searching the usual places, it seems the ones offered are generic chevy parts when you read the fine print. i know they will physically bolt up, but when i inquired to several vendors, they [for some reason] couldn't supply me with the O-ring diameter.
does anyone know of a vertical [not swivel] billet housing that will correctly fit a thermostat, and bolt to an aluminum water pump housing with a 2" diameter thermostat hole ?
TIA !

Don't know about the O-ring type but Napa sells a nice OE replacement for like $7... Whatever U do avoid that chunky chrome china job they warp & leak badly..

Just my $0.02...

Hughes Engines.

no chunkychinachrome wanted at any cost ! this will be painted. i'm not a "shiny" kind of guy.
as the saying goes : "chrome don't getcha' home !"

https://www.summitracing.com/parts/bsp-90820/overview/

I'm pretty sure this is the one I bought for my small block. I haven't run the engine yet to see if it seals. I did notice that once the housing was tightened down, the thermostat was still a little loose. The stock thermostat housing holds the thermostat tight. Not sure if this is a big deal or not. I did add a little sealer to the perimeter of the thermostat and it doesn't move now.

This is what you want.

https://bobmazzoliniracing.com/store/#!/Billet-Aluminum-Water-Neck-Package/p/24086606/category=4769098

We have removed several of the chrome ones at my shop, they are always warped. We thought customers were over tightening them until I resurfaced one, it was so soft it clogged my 12" disc sander. They are dead soft! That billit one Mancini sells works good.

On a side note: confirm it is flat & don't overtorque. One place I would use "the right stuff" cement WITH a thin gasket.

I went with this set-up http://www.terrysautolab.com/

Billet, and uses an o-ring not made in China either works great and no more leaks.

duster, that almost looks like a chevy housing with an adapter ? i know there are several housings out there that claim to be for our mopars, but on closer inspection in the details, it says "universal chevy". i know the chevy t-stat is smaller, so a couple outfits i contacted for dimensions, they claimed their supplier didn't have these available, and one said the OD of the O-ring was 2.25. that would just cover the housing hole, which is 2", and i wouldn't feel comfortable with it being that close.

This is the one I used on my wife 440 Six Pack engine with polished PRW aluminum housing.

Installed dry with no sealant and hasn't leaked a drop in 3 years.

I've used a couple of the 440source billet ones, I can't remember if they are o ring but the seal good.