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05-30-2012, 12:11 AM
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#1 |
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Registered User
Join Date: May 2011
Location: Mayflower,AR
Posts: 802
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A Road Draft Tube?
so i bought a 283 block and crank from a guy the other day(got a flame to my butt cuz i thought it would be cool for a future truck, or ratrod, now i realized ive clogged the garage and now its on craigslist), and was confused as to what the heck a black canister was doing in the lifter galley. he said it was a primitive pcv valve. someone want to explain to me whats so great about it? he said they are desired by people with old engines....i just figured it was just like a pcv valve, it just vented the internals....am i right?
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-Mike- '94 GMT 400 ext z71 3" body, 3 in rough country, hd mirrors, 20" motometals on 35s |
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05-30-2012, 12:17 AM
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#2 |
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Registered User
Join Date: Apr 2011
Location: Mustang, Oklahoma
Posts: 2,806
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Re: A Road Draft Tube?
Pretty much just venting, there were no vents in the valve covers. There was a "blow by" pipe that vented off the back of the eng that was connected to the valley canister thingy. in stead of feeding the vent gas back into the carb it just dumped the fumes. Primitive PCV pretty much sums it up, The valve covers look so much cooler with no vent holes in them
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Dan <---(my name) 67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car |
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05-30-2012, 12:25 AM
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#3 |
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Registered User
 
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: A Road Draft Tube?
 Im interested to see what it looks like if its not too much trouble
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72 C20 Longbed 05 1500 Z71 |
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05-30-2012, 01:46 AM
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#4 |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,717
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Re: A Road Draft Tube?
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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05-30-2012, 06:36 AM
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#5 |
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Registered User
Join Date: Apr 2011
Location: Mustang, Oklahoma
Posts: 2,806
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Re: A Road Draft Tube?
The canister in the valley in plugged into a casting in older blocks that comes out between the dist and oil sensor, another pipe plugs into that hole and vents the fumage down the road. I had one on my '67 and a '64 Impala both 283's.
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Dan <---(my name) 67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car |
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05-30-2012, 12:32 PM
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#6 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,948
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Re: A Road Draft Tube?
If you look at old pics of the highways in California, and see all the black streaks down the center of the lanes. It's the black oil slick left behind from road draft tubes.
 Then when it rained... the roads were like a skating rink. Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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05-30-2012, 12:59 PM
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#7 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: A Road Draft Tube?
roaddraft tubes were better than undercoating
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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05-30-2012, 02:17 PM
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#8 | |
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Junior Member
Join Date: Jul 2002
Location: Scottsdale, AZ
Posts: 1,701
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Re: A Road Draft Tube?
Quote:
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"I was patina when patina wasn't cool." 1973 Cheyenne SWB Sunset Gold / Frost White / Saddle |
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05-30-2012, 04:44 PM
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#9 |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,159
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Re: A Road Draft Tube?
Only the small-journal blocks (pre '68) have this provision.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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05-31-2012, 07:59 PM
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#10 |
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Registered User
Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: A Road Draft Tube?
Thanks for the pics
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72 C20 Longbed 05 1500 Z71 |
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08-07-2012, 01:32 AM
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#11 |
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Registered User
Join Date: Nov 2010
Location: Louisiana
Posts: 14
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Re: A Road Draft Tube?
Yea its a oil separator for a road draft tube. Road draft tubes were bad about puking oil droplets along with crankcase fumes at highway speed.
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08-07-2012, 06:19 AM
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#12 |
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Registered User
Join Date: Aug 2011
Location: Northern California
Posts: 189
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Re: A Road Draft Tube?
Yes, the movement of the vehicle created a vacuum at the end of the draft tube to draw fumes out. Fresh air entered the engine through the oil fill "breather cap" at the front.
I can remember every parking space in every parking lot having a giant oil stain at the front end of it from dripping vehicles back in the 60's and 70's. These days, if you spill a quart of fluid somebody will call out the HAZMAT team.
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1971 GMC C2500 Custom Camper - Second Owner. 350/TH350, Dana 60 Rear. |
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08-07-2012, 06:32 AM
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#13 |
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1969 Custom 30 wrecker
Join Date: Sep 2001
Location: Pottsville, Pa
Posts: 2,611
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Re: A Road Draft Tube?
Just an FYI:
I believe the road draft tube was ended after 1962. My 63 Impala is equipped with a pcv valve that goes into the back of the carb. Just in case anyone wanted to know. 
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Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10 |
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08-07-2012, 07:35 AM
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#14 |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,159
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Re: A Road Draft Tube?
I'm pretty sure that the road draft tube continued until 1967 with the end of the small journal cranks. Some earlier ones may have been converted to PCV-maybe for California emissions-but now I'm reaching. I am pretty sure all small journal blocks at least have road draft provisions.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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08-07-2012, 08:07 AM
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#15 | |
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Registered User
Join Date: Aug 2011
Location: Northern California
Posts: 189
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Re: A Road Draft Tube?
Quote:
I had a '65 Chevelle that somebody had put a 327 truck engine in. (Solid lifters, long canister oil filter, etc.) It seems like it had the draft tube setup, but I could be mistaken as that was 30 years ago.
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1971 GMC C2500 Custom Camper - Second Owner. 350/TH350, Dana 60 Rear. |
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08-07-2012, 09:44 PM
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#16 |
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Registered User
Join Date: May 2011
Location: Mayflower,AR
Posts: 802
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Re: A Road Draft Tube?
my block was a 68
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-Mike- '94 GMT 400 ext z71 3" body, 3 in rough country, hd mirrors, 20" motometals on 35s |
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08-08-2012, 08:10 AM
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#17 | |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,159
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Re: A Road Draft Tube?
Quote:
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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08-08-2012, 10:44 AM
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#18 |
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Registered User
Join Date: May 2011
Location: Mayflower,AR
Posts: 802
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Re: A Road Draft Tube?
mark your right. i confused dates. i stand corrected.
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-Mike- '94 GMT 400 ext z71 3" body, 3 in rough country, hd mirrors, 20" motometals on 35s |
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