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Road draft tube #1338733 Sun Dec 22 2019 09:43 PM
Joined: Feb 2003
Posts: 1,343
J
Jeff Ogden Offline OP
Shop Shark
I am looking for another road draft tube for my 37 to modify for a PCV system and need to know what all years look like a 37,pulled one off a 39 or 40 cab over yesterday in a local junkyard but it had holes in it after fighting it for a hour.

Re: Road draft tube [Re: Jeff Ogden] #1338734 Sun Dec 22 2019 09:45 PM
Joined: Jan 2001
Posts: 4,876
P
Pre '68 Dave Online
Shop Shark
I believe 1937-48 had the filler cap on them.


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Re: Road draft tube [Re: Jeff Ogden] #1338751 Sun Dec 22 2019 11:12 PM
Joined: Feb 2011
Posts: 883
Happy Birthday rickmg Offline
Shop Shark
1937-39 216's were the same engine. Could the cab over possibly have a longer draft tube length?

Rick

Re: Road draft tube [Re: Jeff Ogden] #1338776 Mon Dec 23 2019 02:56 AM
Joined: Feb 2003
Posts: 1,343
J
Jeff Ogden Offline OP
Shop Shark
The COE had a normal truck road draft tube,I was expecting one longer but since the brace was not hooked up who knows. I am trying to make it look all original and hide the PCV,my plan is to insert a freeze plug in the bottom where it vents and solder a nipple to the road draft tube near where it goes into the block and then use a screw in PCV near the carb and run a hose down to the road draft tube around the rear of the engine. The tube from the COE had holes in it below where the brace was attached which seemed strange but after taking a 50 to 52 car 235 side cover off that was worse on the inside then out and the hood was shut so it must have been subjected to a bunch of moisture from the ground.

Re: Road draft tube [Re: Jeff Ogden] #1338804 Mon Dec 23 2019 01:35 PM
Joined: Jan 2016
Posts: 519
S
showkey Offline
Shop Shark
GMC had the fill cap on the draft tube well into the 50’s.

Little cutting and welding makes a perfect PVC draw point witha built in liquid vapor screen.

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Last edited by showkey; Tue Dec 24 2019 12:07 AM.
Re: Road draft tube [Re: Jeff Ogden] #1338886 Mon Dec 23 2019 10:33 PM
Joined: Feb 2003
Posts: 1,343
J
Jeff Ogden Offline OP
Shop Shark
Since I have the splash pans I need a original style road draft tube so it will stick through the pan,since I have a engine on the stand now is the time to get the PCV system made where it will be easier to make.

Re: Road draft tube [Re: Jeff Ogden] #1339518 Sun Dec 29 2019 03:06 AM
Joined: Feb 2003
Posts: 1,343
J
Jeff Ogden Offline OP
Shop Shark
I found one from a 41 to 46 that will work.

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Re: Road draft tube [Re: Jeff Ogden] #1339581 Sun Dec 29 2019 05:35 PM
Joined: Feb 2004
Posts: 19,637
H
Hotrod Lincoln Online
Boltergeist
Don't completely close off the down pipe- - - -drill a small hole just above the blockoff plate to allow condensation to drain, maybe 3/32" or so.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Road draft tube [Re: Jeff Ogden] #1340101 Thu Jan 02 2020 04:43 PM
Joined: Mar 2019
Posts: 31
T
TBUChevy Offline
Wrench Fetcher
Don't want to get this thread to far off course. The PCV aspect caught my attention.

When PCV is added to an older engine, how do you determine which PCV valve to use? Is orientation of the valve important? Where should you connect to the intake system?

I ask these questions because of my observations of a PCV system added to an older engine. The valve is mounted horizontally and it never closes. The system is ported directly into the intake manifold. It essentially has become a big vacuum leak directly into the intake manifold. This is especially a problem at idle.


Rusty
Re: Road draft tube [Re: Jeff Ogden] #1340105 Thu Jan 02 2020 04:56 PM
Joined: Sep 2001
Posts: 29,256
tclederman Offline
Boltergeist
You might want to start by doing a search here.

Search on the term PCV

Have a good read.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
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