Non smog BB Exhaust manifolds - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sameyrasmea72 · 02-05-2009, 03:10 AM

I have decided to put a smog pump on my truck so I won’t be needing these. These have been sandblasted and painted in POR-15 manifold gray. Instructions say they will lighten up after they are cured. They are in great shape and are what I believe to be show quality, but they are 37 years old and have some pits and nicks as expected.
They have the correct part #’s and 72 date codes and came off a 72 ¾ ton if the matters to anybody but me.

I would be willing to do some trading for a smog pump system if somebody has one, otherwise $250 +shipping

**breeh** · 02-05-2009, 04:36 AM

I didn't think that the big blocks came under regulation for SMOG systems in '72. Is that a CA standard?

Meticulous restoration, very nice!

**DANTIP** · 02-05-2009, 09:08 AM

Jason,

I have the correct pump with diverter valve and pulley, the upper support bracket for A/C & Smog and I believe I have the lower bracket as well (I will verify what I have at the lake). The toughest parts to find are the correct steel manifold tubes. I have a near perfect set that could be used as models to have one of the Corvette Smog restrorers duplicate. I also have dozens of photos of installed systems on 72' 1/2 ton big block that I found helpful.

Dan Tippmann

**DANTIP** · 02-05-2009, 09:28 AM

Breeh,

My understanding is that ALL 1972 1/2 ton big block trucks came with smog systems. Also the 402 in the 1/2 ton trucks was not available for sale in California.

Dan Tippmann

sameyrasmea72 · 02-05-2009, 10:18 AM

Quote:

Originally Posted by breeh

I didn't think that the big blocks came under regulation for SMOG systems in '72. Is that a CA standard?

Meticulous restoration, very nice!

Most 72 BB I have seen originally had a smog punp. I think 3/4 tons were exempt.

Dan I will PM you when I get a chance.

1956cameo · 02-05-2009, 12:47 PM

My 3/4 ton 402 BB suburban is bone stock original, and it has smog pump and components on it. I even got the original dealership smog pump brochure in the glove box so I really believe that it is original to that truck. So I know that at least some of the 3/4 ton BB burbs came with smog equipment.

**DANTIP** · 02-05-2009, 01:10 PM

The 1972 New Product Information/Preliminary Shop Manual that states, "Air Injection Reactor Systems are released as applicable for all passenger vehicles, all 10-series trucks, the C-K20 Suburban, all G10-20 Series and G-30 Sportvans. In the Engine section there is verification that the only 402 powered trucks allowed for sale in California were C20-30 trucks (not suburbans), and motor-homes.

**breeh** · 02-05-2009, 02:15 PM

Interesting. So, just the C/20 with BB did not come with the AIR system. That explains my shallow knowledge about it. I have only ever seen the C/20 big blocks. Thanks for the learning. Sorry for hijacking your thread sameyrasmea72.

stope4 · 02-05-2009, 09:22 PM

I noticed the flanges are connected on these manifolds. I didn't think that happened until later. My original 71 manifolds are not connected. The flanges (or ears) for each cylinder are separate. Is this something that started in 72?

71 super · 02-05-2009, 10:03 PM

Connected are later units all early manifolds were seperated and created the problems you are having now. The repops are also connected as these pictured are.

sameyrasmea72 · 02-07-2009, 12:14 AM

I have 7-8 of the ones with the connected ears. As far as I can remember they are all 72. I have one that is not connected and I looked it up and it showed in the book to be a 68-69.

sameyrasmea72 · 02-07-2009, 12:16 AM

Quote:

Originally Posted by stope4

I noticed the flanges are connected on these manifolds. I didn't think that happened until later. My original 71 manifolds are not connected. The flanges (or ears) for each cylinder are separate. Is this something that started in 72?

I think 70-71 were connected too, but not positive. The only way to tell if yours are really the original 71's is to look on the back side for the date code.

**Hart_Rod** · 08-12-2009, 06:26 PM

Your chassis rocks! How about some updated........

.

sameyrasmea72 · 08-12-2009, 07:22 PM

Updated chassis ? Hmmm, No pics, but picture this.... No engine/trans and covered in about an inch of dust.

It just bugged me to death to have the incorrect engine with that incorrect high rise intake, so I pulled the motor and I am going to put back in the original 402 that came with the truck.

BCOWANWHEELS · 08-12-2009, 11:23 PM

Pal you sure do good work. Outstanding.......

02-05-2009, 03:10 AM	#1
sameyrasmea72 Senior Member Join Date: Aug 2003 Location: Lubbock, Texas Posts: 2,443	Non smog BB Exhaust manifolds I have decided to put a smog pump on my truck so I won’t be needing these. These have been sandblasted and painted in POR-15 manifold gray. Instructions say they will lighten up after they are cured. They are in great shape and are what I believe to be show quality, but they are 37 years old and have some pits and nicks as expected. They have the correct part #’s and 72 date codes and came off a 72 ¾ ton if the matters to anybody but me. I would be willing to do some trading for a smog pump system if somebody has one, otherwise $250 +shipping Attached Images __________________ 72 Cheyenne Super 80 Silverado Blazer 2wd

02-05-2009, 04:36 AM	#2
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	Re: Non smog BB Exhaust manifolds I didn't think that the big blocks came under regulation for SMOG systems in '72. Is that a CA standard? Meticulous restoration, very nice! __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

02-05-2009, 09:08 AM	#3
DANTIP Registered User Join Date: Sep 2001 Location: Fort Wayne, Indiana, USA Posts: 1,889	Re: Non smog BB Exhaust manifolds Jason, I have the correct pump with diverter valve and pulley, the upper support bracket for A/C & Smog and I believe I have the lower bracket as well (I will verify what I have at the lake). The toughest parts to find are the correct steel manifold tubes. I have a near perfect set that could be used as models to have one of the Corvette Smog restrorers duplicate. I also have dozens of photos of installed systems on 72' 1/2 ton big block that I found helpful. Dan Tippmann

02-05-2009, 09:28 AM	#4
DANTIP Registered User Join Date: Sep 2001 Location: Fort Wayne, Indiana, USA Posts: 1,889	Re: Non smog BB Exhaust manifolds Breeh, My understanding is that ALL 1972 1/2 ton big block trucks came with smog systems. Also the 402 in the 1/2 ton trucks was not available for sale in California. Dan Tippmann

02-05-2009, 12:47 PM	#6
1956cameo Registered User Join Date: Apr 2008 Location: Angleton, TX Posts: 2,219	Re: Non smog BB Exhaust manifolds My 3/4 ton 402 BB suburban is bone stock original, and it has smog pump and components on it. I even got the original dealership smog pump brochure in the glove box so I really believe that it is original to that truck. So I know that at least some of the 3/4 ton BB burbs came with smog equipment.

02-05-2009, 01:10 PM	#7
DANTIP Registered User Join Date: Sep 2001 Location: Fort Wayne, Indiana, USA Posts: 1,889	Re: Non smog BB Exhaust manifolds The 1972 New Product Information/Preliminary Shop Manual that states, "Air Injection Reactor Systems are released as applicable for all passenger vehicles, all 10-series trucks, the C-K20 Suburban, all G10-20 Series and G-30 Sportvans. In the Engine section there is verification that the only 402 powered trucks allowed for sale in California were C20-30 trucks (not suburbans), and motor-homes. Last edited by DANTIP; 02-05-2009 at 01:27 PM. Reason: Found better info

02-05-2009, 02:15 PM	#8
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	Re: Non smog BB Exhaust manifolds Interesting. So, just the C/20 with BB did not come with the AIR system. That explains my shallow knowledge about it. I have only ever seen the C/20 big blocks. Thanks for the learning. Sorry for hijacking your thread sameyrasmea72. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

02-05-2009, 09:22 PM	#9
stope4 Registered User Join Date: Jan 2006 Location: Houston Posts: 434	Re: Non smog BB Exhaust manifolds I noticed the flanges are connected on these manifolds. I didn't think that happened until later. My original 71 manifolds are not connected. The flanges (or ears) for each cylinder are separate. Is this something that started in 72?

02-05-2009, 10:03 PM	#10
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,079	Re: Non smog BB Exhaust manifolds Connected are later units all early manifolds were seperated and created the problems you are having now. The repops are also connected as these pictured are. __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle

02-07-2009, 12:14 AM	#11
sameyrasmea72 Senior Member Join Date: Aug 2003 Location: Lubbock, Texas Posts: 2,443	Re: Non smog BB Exhaust manifolds I have 7-8 of the ones with the connected ears. As far as I can remember they are all 72. I have one that is not connected and I looked it up and it showed in the book to be a 68-69. __________________ 72 Cheyenne Super 80 Silverado Blazer 2wd

08-12-2009, 06:26 PM	#13
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,856	Re: Non smog BB Exhaust manifolds Your chassis rocks! How about some updated......... __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

08-12-2009, 07:22 PM	#14
sameyrasmea72 Senior Member Join Date: Aug 2003 Location: Lubbock, Texas Posts: 2,443	Re: Non smog BB Exhaust manifolds Updated chassis ? Hmmm, No pics, but picture this.... No engine/trans and covered in about an inch of dust. It just bugged me to death to have the incorrect engine with that incorrect high rise intake, so I pulled the motor and I am going to put back in the original 402 that came with the truck. __________________ 72 Cheyenne Super 80 Silverado Blazer 2wd

08-12-2009, 11:23 PM	#15
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Non smog BB Exhaust manifolds Pal you sure do good work. Outstanding....... __________________ I BELIEVE IN JOHN 3:16

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