Ever seen a Ramhorn like this? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

red71cheyenne · 10-18-2005, 09:54 PM

Can't figure out what the holes are for. They are 3/8 NPT by the way. Anybody? Jeff.

70short/step · 10-18-2005, 09:56 PM

Smog tube fittings

red71cheyenne · 10-18-2005, 10:01 PM

Wierd! Anybody got a pic of one with the smog tubes on it? Thanks, Jeff.

LUV2XCLR8 · 10-18-2005, 10:06 PM

Quote:

Originally Posted by 70short/step

Smog tube fittings

Yeppers

Longhorn Man · 10-18-2005, 10:13 PM

That's the only style I have seen.

**special-K** · 10-19-2005, 07:33 AM

All the ones I`ve seen are capped-off from factory.Even on California trucks.Was it just`72,I think?GM made the provision,but didn`t utilize them.This was back when Capitol Hill was starting to build cars.The Feds were bombarding mfgrs right and left with new safety and environmental requirements.

red71cheyenne · 10-19-2005, 09:13 AM

I had no idea they ever came like that. Course I don't think I've ever seen one of our trucks with the smog equipment installed either. Thanks for the help guys, Jeff.

Joe67 · 10-19-2005, 09:16 AM

Yep, the 327 in the Panel has them capped off

**kwmech** · 10-19-2005, 09:43 AM

They are not a pipe thread. It is a 5/16'' tubing thread. If you plug those with a pipe plug and tighten them too much you can crack the manifold. They do make a tubing plug. What is close is a 1/4 pipe--not 3/8.

red71cheyenne · 10-19-2005, 10:11 AM

Good to know. I just tried screwing different plugs in it and 3/8 seemed to fit best. Didn't have a 5/16 though. How do you decide which one fits best and won't crack it?

ChevLoRay · 10-19-2005, 10:25 AM

C.A.R.B. in California, "paved" the way for the Feds to make all kinds of emissions-related items mandatory for vehicles. California started in the early-mid 60's. They required PCV valves to be retrofitted to anything 1955 and newer, to replace the Road Draft tubes that vented crankcase gasses, and smoke, off the back of most engines and to the ground.

The smog pumps were required in CA, long before the rest of the U.S. got them.

Hot Rod magazine did a build-up on a Camaro, in the late 70's/early 80's, in which they over-drove a smog pump and pumped so much fresh air down the smog tubes that (their words) the sniffer thought it was seeing fresh air.

farside847 · 10-19-2005, 11:30 AM

I remember a smog pump setup in my 74 chevy stepside. Kinda a pain in the but.

70rs/ss · 10-19-2005, 11:43 AM

Quote:

Originally Posted by red71cheyenne

Can't figure out what the holes are for. They are 3/8 NPT by the way. Anybody? Jeff.

My 68 Burb that qksilver bought from me had the air tubes in the ram horns as well as the smog pump. As for the curve, that looks like a Chevelle or Nova manifold, or did the 2wd aim back? I have 4X4 and they all dump straight down?

jc · 10-19-2005, 12:09 PM

i have had 2 trucks with the smog pums and air tube set up 1 was a 71 4x4 from cali and the other was 72 .
i have a set of the tubes one side is in excelant condition the other needs repair. if any one needs em i will sell em

Dean · 10-19-2005, 12:19 PM

My 1970 20,000 mile C20 had those on it with all the smog stuff. I still have them in my garage with all the tubes on it. Most of them around here probably rusted away long ago and got plugged.

red71cheyenne · 10-19-2005, 12:38 PM

Ya, these were supposed to be the 4x4 model, but I'm pretty sure they are the driver side for 2wd models. Of course they are made in China, so who knows what they are actually for. Won't work on my Blazer, on the driver side anyway. Jeff.

70rs/ss · 10-19-2005, 12:51 PM

Quote:

Originally Posted by red71cheyenne

Ya, these were supposed to be the 4x4 model, but I'm pretty sure they are the driver side for 2wd models. Of course they are made in China, so who knows what they are actually for. Won't work on my Blazer, on the driver side anyway. Jeff.

I have an extra set of 4X4 ram horns, if you are interested. They are the straight dump.

red71cheyenne · 10-19-2005, 12:55 PM

Thanks, I just ordered a set of straight dump last night. Jeff.

**special-K** · 10-19-2005, 10:48 PM

My California trucks have the plugs.CA started that stuff in`65.Rams horns are straight for 4wd/curved back for 2wd,fer shur.

Green Machine · 10-19-2005, 11:00 PM

Yep, same as on my truck, my 68 Iowa truck used to had a smog pump at one time, for soe reason, ans I second what kwmech said, those are not pipe thread, use a flare tubing type plug.

toms68cst · 10-20-2005, 04:40 PM

The best I can tell, starting in 67 in califorinia and 68 and later nationwide, manual transmission 1/2 ton trucks were equipped with smog pumps. Autos had heat risers. As soon as we get attachments back I'll post a picture or two. My 68 327 still has its smog pump.

steve75104 · 10-20-2005, 04:49 PM

The truck I had 20 years ago actually had the lines hooked up. When we pulled the smog pump, we plugged them though. But they were hooked up when I got the truck in '73 (in Texas).

red71cheyenne · 10-20-2005, 05:00 PM

How do I distinguish between NPT and flare tubing threads? I'd hate to crack my new straight dumps. Thanks, Jeff.

Sweet72 · 10-20-2005, 07:13 PM

My 72 GMC (Baltimore Assembly plant) has the bosses on the manifolds but they were not machined for smog tubes.

Green Machine · 10-20-2005, 09:19 PM

I don't recall if the flare tubing nut is for 5/16 or 3/8 tube, but its one of those, get a tubing nut and see how it fits, a tubing nut should turn in 3-4 turns by hand, and stop suddenly when it bottoms out, get a plug in that exact same size, a NPT plug may turn in by hand about 1 turn or so and get harder to turn as you go , thats not right - you'll know when you get it right

10-18-2005, 09:54 PM	#1
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Ever seen a Ramhorn like this? Can't figure out what the holes are for. They are 3/8 NPT by the way. Anybody? Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty Last edited by red71cheyenne; 10-04-2007 at 08:37 PM.

10-18-2005, 09:56 PM	#2
70short/step Registered User Join Date: Dec 2003 Location: Stockton, CA Posts: 1,579	Re: Ever seen a Ramhorn like this? Smog tube fittings __________________ For every person with a spark of genius, There are a hundred with ignition trouble. 70 Short/Step

10-18-2005, 10:01 PM	#3
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Ever seen a Ramhorn like this? Wierd! Anybody got a pic of one with the smog tubes on it? Thanks, Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

10-18-2005, 10:13 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Ever seen a Ramhorn like this? That's the only style I have seen.

10-19-2005, 07:33 AM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Ever seen a Ramhorn like this? All the ones I`ve seen are capped-off from factory.Even on California trucks.Was it just`72,I think?GM made the provision,but didn`t utilize them.This was back when Capitol Hill was starting to build cars.The Feds were bombarding mfgrs right and left with new safety and environmental requirements. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-19-2005, 09:13 AM	#7
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Ever seen a Ramhorn like this? I had no idea they ever came like that. Course I don't think I've ever seen one of our trucks with the smog equipment installed either. Thanks for the help guys, Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

10-19-2005, 09:16 AM	#8
Joe67 67 is sold Join Date: Apr 2001 Location: Troy, Michigan Posts: 6,738	Re: Ever seen a Ramhorn like this? Yep, the 327 in the Panel has them capped off __________________ Joe - Formerly 67c10step ------------------------------- 1967 Chevy Stepside - ECE 4/6, fuelcell, 5lug - SOLD gr8lakes - My ebay auctions Click here to order forum apparel :: Click here to become a subscribing member

10-19-2005, 09:43 AM	#9
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,598	Re: Ever seen a Ramhorn like this? They are not a pipe thread. It is a 5/16'' tubing thread. If you plug those with a pipe plug and tighten them too much you can crack the manifold. They do make a tubing plug. What is close is a 1/4 pipe--not 3/8.

10-19-2005, 10:11 AM	#10
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Ever seen a Ramhorn like this? Good to know. I just tried screwing different plugs in it and 3/8 seemed to fit best. Didn't have a 5/16 though. How do you decide which one fits best and won't crack it? __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

10-19-2005, 10:25 AM	#11
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Ever seen a Ramhorn like this? C.A.R.B. in California, "paved" the way for the Feds to make all kinds of emissions-related items mandatory for vehicles. California started in the early-mid 60's. They required PCV valves to be retrofitted to anything 1955 and newer, to replace the Road Draft tubes that vented crankcase gasses, and smoke, off the back of most engines and to the ground. The smog pumps were required in CA, long before the rest of the U.S. got them. Hot Rod magazine did a build-up on a Camaro, in the late 70's/early 80's, in which they over-drove a smog pump and pumped so much fresh air down the smog tubes that (their words) the sniffer thought it was seeing fresh air. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

10-19-2005, 11:30 AM	#12
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	Re: Ever seen a Ramhorn like this? I remember a smog pump setup in my 74 chevy stepside. Kinda a pain in the but. __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

10-19-2005, 12:09 PM	#14
jc Registered User Join Date: Jan 2001 Location: Jackson, New Jersey Posts: 1,560	Re: Ever seen a Ramhorn like this? i have had 2 trucks with the smog pums and air tube set up 1 was a 71 4x4 from cali and the other was 72 . i have a set of the tubes one side is in excelant condition the other needs repair. if any one needs em i will sell em __________________ 2004 Silverado 2500HD Crewcab 4x4 2000 TOYOTA 4RUNNER 1971 CHEYENNE LWB (THE LOVE SHACK) 1967 c-10 lwb (THE FARMERS DAUGHTER)

10-19-2005, 12:19 PM	#15
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	Re: Ever seen a Ramhorn like this? My 1970 20,000 mile C20 had those on it with all the smog stuff. I still have them in my garage with all the tubes on it. Most of them around here probably rusted away long ago and got plugged.

10-19-2005, 12:38 PM	#16
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Ever seen a Ramhorn like this? Ya, these were supposed to be the 4x4 model, but I'm pretty sure they are the driver side for 2wd models. Of course they are made in China, so who knows what they are actually for. Won't work on my Blazer, on the driver side anyway. Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

10-19-2005, 12:55 PM	#18
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Ever seen a Ramhorn like this? Thanks, I just ordered a set of straight dump last night. Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty



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10-19-2005, 10:48 PM	#19
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Ever seen a Ramhorn like this? My California trucks have the plugs.CA started that stuff in`65.Rams horns are straight for 4wd/curved back for 2wd,fer shur. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-19-2005, 11:00 PM	#20
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: Ever seen a Ramhorn like this? Yep, same as on my truck, my 68 Iowa truck used to had a smog pump at one time, for soe reason, ans I second what kwmech said, those are not pipe thread, use a flare tubing type plug. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

10-20-2005, 04:40 PM	#21
toms68cst Registered User Join Date: Jun 2000 Location: Bismarck, ND Posts: 4,293	Re: Ever seen a Ramhorn like this? The best I can tell, starting in 67 in califorinia and 68 and later nationwide, manual transmission 1/2 ton trucks were equipped with smog pumps. Autos had heat risers. As soon as we get attachments back I'll post a picture or two. My 68 327 still has its smog pump. __________________ Unrestored 68 C-10 CST. Original 327. 4-Speed CH465. 50k or so miles. TREASURER, Drum Brake Club.

10-20-2005, 04:49 PM	#22
steve75104 Another 69-20 years later Join Date: Oct 2004 Location: Cedar Hill, TX Posts: 94	Re: Ever seen a Ramhorn like this? The truck I had 20 years ago actually had the lines hooked up. When we pulled the smog pump, we plugged them though. But they were hooked up when I got the truck in '73 (in Texas). Last edited by steve75104; 10-20-2005 at 04:50 PM.

10-20-2005, 05:00 PM	#23
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Ever seen a Ramhorn like this? How do I distinguish between NPT and flare tubing threads? I'd hate to crack my new straight dumps. Thanks, Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

10-20-2005, 07:13 PM	#24
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	Re: Ever seen a Ramhorn like this? My 72 GMC (Baltimore Assembly plant) has the bosses on the manifolds but they were not machined for smog tubes. __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction. Last edited by Sweet72; 10-20-2005 at 07:14 PM.

10-20-2005, 09:19 PM	#25
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: Ever seen a Ramhorn like this? I don't recall if the flare tubing nut is for 5/16 or 3/8 tube, but its one of those, get a tubing nut and see how it fits, a tubing nut should turn in 3-4 turns by hand, and stop suddenly when it bottoms out, get a plug in that exact same size, a NPT plug may turn in by hand about 1 turn or so and get harder to turn as you go , thats not right - you'll know when you get it right __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

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