I know the DP from offenhauser does not, but does their single plane intake have a heated water jacket?

I live in ND where it is not unusual to see -20 temps and not uncommon to see at least 5 days of -30 temps so a heated manifold is a must.

 

I don't think either the offy DP or C series intake have a water provision. I believe both can utilize the stock exhaust manifold as a heat source, though.

 

On that note, you *could* get creative, and make a plate to bolt onto the bottom of the intake, and put 2 nipples in it. Route the heater hose thru the intake that way.
This would allow for either EFI manifolds or headers to be used, and still warm the intake.

 

Is the clifford the one with the water jacket?

 

Maybe. It's been a while since I saw a clifford. Not too many people can afford their stuff.....

 

Intake Manifolds, Carbureted - SummitRacing.com

That is summit's page with both styles of offy intakes. Neither appear to have a water jacket provision, but both appear to be capable of bolting to the stock carbed exhaust manifold.
I saw pictures somewhere on here where someone made a plate to bolt to the bottom with 2 5/8" hose nipples. Seems like a fairly easy way to apply some warmth to the intake, without getting it too hot.

 

Bolting the plate with hose barb fittings is the common way to get heat to the Offy manifold.





Besides heat, it provides coolant when hot and stabilizes intake temperatures...something that carbs seem to like.

 

Perfect example of what I was trying to say. Thanks!

 

A picture is worth a thousand words!

 

The Clifford's the only one with the heat provisions that I've ever heard of.

If you make one, you can easily base it off the gasket that comes with the intake/exhaust manifold kit:


Get some simple tubing from the plumbing store:


And bolt it underneath:



Just make sure that you really get everything sealed, and nice and tight. Indian Head Gasket Shellac works really well for that (as you can see, it's covered in it in later pictures.)

Also, make sure your holes match the gasket, unlike my first picture. =P

The pics show it bolted to the underside of the stock intake, but the same provision is on the Offenhauser.


The last option is a heated 4bbl spacer with an in/out for coolant. No one seems to make them for some odd reason, but they show up in junk yards and ebay from time to time.
I believe they're usually off of Ford Galaxies and look something like this:


<img src= "https://www.fordmuscle.com/forums/attachments/galaxie-pages/8060d1241574998-need-4-barrel-carb-spacer-im000190.jpg" width=666 height=500>

 

Yes, the Clifford is the only one with plumping. I like AB's hose attachments because they clear the intake/exh, and make it a lot easier to attach the hoses that way.

It is too bad I/we can't devise a way to get exhaust heat to carb rather than the coolant heating system. On cold mornings it takes quite a while for coolant to get hot.

I simply buzzed the galv. elbows with a grinder, and welded them to the plate...no leaks, no tightening ever. Where the hose slips on, and I know it is not the best system, but I just cut off the threads and cleaned the edge with a grinder, and slipped the hoses right onto the pipe.





I've seen those heated spacers on ebay as well. The ones I have seen have sold for about $50. Good luck. And if I were you, I would weld where the nipple connects to the elbow too. I did not and found myself tightening it several times, even after sealing with teflon. Use silicone on both sides of plate gasket. Let dry.

 

Wouldn't hooking the heater hoses to the plate and bolting it to the intake manifold shoot water into the cylinders?

 

The 4.9/300 engines run on water and squirrel **** . Dont tell the EPA that though.

So you say that the heated water add on works good but takes a while to get it warmed up.

 

It won't take any longer for this method to warm the intake, than the clifford system.

 

No, the opening underneath the intake is a hollow chamber that doesn't tie in with the cylinders at all. It does tie in with the A.I.R. inlet in the carb spacer.
You can see it a little bit in this picture (the only one I have)



Just to the right of the big opening for the carb. In this pic, there's a gasket covering it that I made, but you can see the circle shape in it. The coolant kept eating through the gasket, so I eventually found the best method was to just put a plug in the carb spacer that tied in with the AIR inlet.

The thing you do want to be sure of when doing this, especially if you're just reusing your current intake, is to thoroughly clean that chamber out before hooking a coolant system up to it. It'll most likely be filled with years of carbon from exhaust filling the chamber to warm it up. A coolant flush through there will quickly turn all your antifreeze a nice murky brown.