Water outet substitution

[Sniper]

There was a thread recently about using the later MoPar V8 water outlet.  To jump real quick to the end, it can be made to work fairly easily.  I already new that the flathead six and V8's used the same gasket there so I was pretty sure the outlet bolt spacing would also be the same, but the proof is in the pudding.  The real trick was sorting out a molded hose.  Did some poking around on the internet cam thought I might have found one.

 

The two main parts used

 

 

[Sniper]

Looking at the old housing versus the new, you can see the new one is much shorter and the hose diameter is 1 1/2" vice the older one's 1 3/4".

 

 

[Sniper]

In order to mate the outlet to the stock radiator I wanted a molded hose.  Now Dayco makes adapters that slip into the hose to neck down the inner diameter, that could work but with the height difference between the outlets the hose I have would have been too short so I would need a new hose anyway.  So then the choice is a molded hose or one of those ribbed universal types.  Both would need a 1 3/4" and 1 1/2" end.  I don't like the ribbed hoses, esthetic reasons.  SO a molded hose was sought.  Here we see the old hose compared to the one I found.

 

 

Edited May 18, 2023 by Sniper

[Sniper]

Offering up the new hose to determine cut line, it's a bit long so it's an eyeball mark.

 

 

[Sniper]

Many ways to cut a hose, I couldn't find my hose cutter.  So I improvised

 

 

[Sniper]

Test fitting the housing, making sure the bolt holes line up.

 

 

[Sniper]

Yes the old thermostat fits the new housing.

 

 

[Sniper]

All mocked up and fitted.

 

 

[Sniper]

Ready for a fill and fire up, I didn't drag out my vacuum dill tool for this one.  Just the big funnel

 

 

 

 

[Sniper]

To sum up, it fit well, Once refilled and capped I fired it up and let it heat up.  Pressure built up nicely, I did have some leakage at one bolt, tightened them up till it stopped. 

[andyd]

I had the V8 thermostat housing as I have a 318 in the 40 Dodge & when I bought the Edgy Head it was obvious that the alloy V8 housing would suit the Flathead six so thats what I intended to do and why I mentioned it in the earlier thread................in this pic its mocked up on the Edgy head............and its nice & shiney to boot.....lol.......andyd

[DJK]

Thank you Sniper, great info.

[Rodney_Hamon]

Yes Sniper, thanks for cleaning up this topic with good info and pix’s. I do like the clean look of a molded hose that properly comes off the housing. Flex hoses always kinda look like lower radiator hoses, eh. One thing, what’s your opinion on a little blue rtv on the gasket before installation. I don’t put it on the bolts though

[rallyace]

I always use a hacksaw to cut radiator hoses. It is much safer than using a utility knife.

[Sniper]

1 hour ago, rallyace said:

I always use a hacksaw to cut radiator hoses. It is much safer than using a utility knife.

 

I have a special tool to cut hoses, wherever it is. 

 

 

As for RTV, I had a bad experience with it years ago and lost an engine, so no RTV for me ust about 100% of the time.

[DJK]

I use 3M weather trim cement (8001) to secure gaskets in place, RTV is too slippery.

[Saskwatch]

Thank you for posting this sniper. 
   With the stock thermostat housing, the thermostat doesn’t fit as tightly/snug  as you show in your pictures, there is approximately a 1/16” space all the way around that the thermostat can wiggle around in the housing ….. would the new V-8 housing be an upgrade or possibly do I have the wrong thermostat? 
   Also would like to ask , in the final installed photo , is that a water temperature sender you have plumbed into the base of the housing? 
 Thank you ?

[Dartgame]

Use a mopar V8 1970's thermostat that fits the housing. I like the robertshaw style stats, much more reliable opening temperature and also a larger opening vs the big box cheapo stats. Your choice !

[Sniper]

8 hours ago, Saskwatch said:

Thank you for posting this sniper. 
   With the stock thermostat housing, the thermostat doesn’t fit as tightly/snug  as you show in your pictures, there is approximately a 1/16” space all the way around that the thermostat can wiggle around in the housing ….. would the new V-8 housing be an upgrade or possibly do I have the wrong thermostat? 
   Also would like to ask , in the final installed photo , is that a water temperature sender you have plumbed into the base of the housing? 
 Thank you ?

 

I dunno about the thermostat, the one I was running is just a modern parts store piece. 

 

There are two temperature switches in that spacer below my thermostat housing.  I am running a two speed electric fan and one switch is set to go on at 185 off at 175, the other at 195 off at 185.  I plan on adding AC in as well and the stock mechanical fan isn't going to cut it in west Texas in the summer. 

[YukonJack]

On 12/9/2022 at 6:08 PM, Sniper said:

 

I dunno about the thermostat, the one I was running is just a modern parts store piece. 

 

There are two temperature switches in that spacer below my thermostat housing.  I am running a two speed electric fan and one switch is set to go on at 185 off at 175, the other at 195 off at 185.  I plan on adding AC in as well and the stock mechanical fan isn't going to cut it in west Texas in the summer. 

Where did you get the spacer?

[Sniper]

Amazon Meziere WN0028U

 

https://www.amazon.com/gp/product/B003NDJF02/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1