Frost Plug Size for Road Draft Tube.


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By oldcarmark - 6 Years Ago
Does anyone know the Size of Frost Plug used to plug the Block when the Road Draft Tube is removed? I did One Years ago and someone on the Site knew the proper Size, Can't find that Info 
By darrell - 6 Years Ago
1 1/4
By paul2748 - 6 Years Ago
Do the bolt holes go completely into the inside?  On a side mounted road draft tube, a plate is usually used.  You can make one up yourself using the gasket for sizing and a piece of aluminum
By oldcarmark - 6 Years Ago
The Bolt Holes go through to the Crankcase. I used a 1 1/4" Plug and added 2 Bolts with Washers that overlap the Plug so it can't come out.
By paul2748 - 6 Years Ago
If you are worried that it might come out, aren't you worried that it may go in?

oldcarmark (11/8/2018)
The Bolt Holes go through to the Crankcase. I used a 1 1/4" Plug and added 2 Bolts with Washers that overlap the Plug so it can't come out.


By darrell - 6 Years Ago
that plug is not going anywhere.
By 56_Fairlane - 6 Years Ago
There is a block off plate specially for this that is available as an OEM part. I have on on my engine.
By oldcarmark - 6 Years Ago
Got a part #? Found it. B5S-6869-A. Originally a T-Bird Part to block off opening in Block with rear Draft Tube on Birds.
By 56_Fairlane - 6 Years Ago
Here's an ebay listing for it: https://www.ebay.com/itm/NOS-FORD-THUNDERBIRD-B5S6869A-1955-1957-55-56-Y-BLOCK-CRANKCASE-BLOCK-OFF-PLATE-/311350594328
It's considerably more than a freeze plug but I would trust it more.
By oldcarmark - 6 Years Ago
Larry's sells a Repro for a lot less than the Originals. Ordered a Fuel Pump Block Off Plate from Amazon.Thanks
By 56_Fairlane - 6 Years Ago
Does the fuel pump block off plate have the same bolt spacing as the draft tube?
By oldcarmark - 6 Years Ago
Yes. 1 3/4" C to C Bolt Holes. Comes with Gasket and 2 Chrome Bolts. Don't know if Bolts are correct yet.
By 56_Fairlane - 6 Years Ago
You can always reuse your old allen head bolts. I didn't get a gasket with mine. Amazingly I was still able to reuse my original gasket from the draft tube.
By KULTULZ - 6 Years Ago
"Comes with Gasket and 2 Chrome Bolts"

Gotta have that BLING ...

Just a thought to whomever may come across this thread in the future, the road draft assy can be be made inoperative by placing a steel shim gasket behind it and along with a well hidden PCV Sytem, can be made to look bone stock.
By oldcarmark - 6 Years Ago
KULTULZ (11/10/2018)
"Comes with Gasket and 2 Chrome Bolts"

Gotta have that BLING ...

Just a thought to whomever may come across this thread in the future, the road draft assy can be be made inoperative by placing a steel shim gasket behind it and along with a well hidden PCV Sytem, can be made to look bone stock.

It just happens to come with Bolts. I will be Painting Engine so it doesn't matter to Me if I use them or not. If you want to use the Draft Tube inoperative You have to cut off the Drain Back Tube before U can block it.
By 56_Fairlane - 6 Years Ago
That's right OldcarMark. I wanted to mention that and you beat me to it. It's just easier to use a block off plate. I've also heard there's a block off plate used on a VW flat 4 that also works.
By KULTULZ - 6 Years Ago
"It just happens to come with Bolts. I will be Painting Engine so it doesn't matter to Me if I use them or not."

Sir, that comment was not directed at you personally. Sorry if I upset you.
By oldcarmark - 6 Years Ago
KULTULZ (11/10/2018)
"It just happens to come with Bolts. I will be Painting Engine so it doesn't matter to Me if I use them or not."

Sir, that comment was not directed at you personally. Sorry if I upset you.

Not a Problem. I am thinking about your Suggestion to keep the Draft Tube for Appearance only. I have 2 so I can sacrifice One. Thanks
By 56 Parklane - 5 Years Ago
i used the freeze plug then trimmed off the drain tube and put the road draft tube back on  looks stock 
By oldcarmark - 5 Years Ago
56 Parklane (1/20/2019)
i used the freeze plug then trimmed off the drain tube and put the road draft tube back on  looks stock 

I did the same but I cut a Piece of Tin to cover the Opening held in place by the mounting Bolts for the Road Draft. I didn't find the Frost Plug very tight. Could fall inside Oil Pan as the Block heats up.