Big block parts identification - can you solve this? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72 longhorn BB · 09-12-2005, 12:34 PM

Hey there my big block bretheren,

It has been three years since I took it apart and now she is going back together and back into the longhorn.

Only problem is, it has been a while and I can not remenber what these parts are for.

Can you tell me what they are?

Also, I am trying to find a replacement exhaust manifolt blot/stud for teh left front hole that the PS bracket attaches to.

anyone got one, or know where I can find one?

Much thanks in advance me amigos!

-Chuckster

blazerparts · 09-12-2005, 12:38 PM

the long one in the top pic looks like the vacuum for the trans.......if you have auto

panhandler62 · 09-12-2005, 12:39 PM

In the first picture you have two vacume fittings.. the small one looks like the signal line for the distributer and the second like it might be for a PCV fitting.

I'm not sure what the gizmo in the second pic is.

72 longhorn BB · 09-12-2005, 01:13 PM

Ok, so
C = Trans vaccum line

B = PCV?

A = ?????

What about the manifold stud/bolt?

Anyone know where they can be gotten?

**CPNE** · 09-12-2005, 01:23 PM

A=Vacuum advance from carb to dizzy
B=Crankcase ventilation but not the PVC valve. Goes to fire arrestor spacer that sits on top of carb to RH valve cover

Frizzle Fry · 09-12-2005, 01:52 PM

I just installed headers and I used a long bolt with two nuts on it where you are describing. One nut to tighten the header flange, and the other to sandwich the PS pump bracket with the bolt head.

Edit: The manifold had the same bolt with a spacer instead of the nuts.

panhandler62 · 09-12-2005, 02:01 PM

Quote:

Originally Posted by CPNE

A=Vacuum advance from carb to dizzy
B=Crankcase ventilation but not the PVC valve. Goes to fire arrestor spacer that sits on top of carb to RH valve cover

That's correct. I was wrong.

72 longhorn BB · 09-12-2005, 03:02 PM

Thanks all for the parts ID info, and the suggestion for the PS bracket stud.

I am really trying to make it look OEM, though, so I am trying to locate a bolt/stud that looks like the one in the illustrated parts book.

tThis is a crude drawing, but it shows what I am talking about.

It must have gotten lost when it was being rebuilt.

Gotta find a replacement.

Any ideas men?

acloco · 09-12-2005, 05:07 PM

B is the fresh air side of the PCV valve - breather in factory air filter housing.

Spark arrestor type is longer and has one more bend in it....had to go under the air cleaner.

The stud you are looking for...harder than heck to find....try GM parts.

kelsfine69 · 09-12-2005, 07:08 PM

I also had a hard time finding that stud/bolt. Go to a big truck wrecker, 3 ton , schoolbus....etc.........I found a lot on a bus with a 427BB

demi · 09-12-2005, 07:47 PM

You Could try here - ClassicIndustries.com

Part #1256624

72 longhorn BB · 09-12-2005, 10:42 PM

Hey guys, do any of you have any pictures of all the hose routings on your BB's?

I don't know why I did not ask about this sooner, but it makes sense.

My rig is trying to be totally OEM, so if you have any pictures of teh hoese and tubes we just described while in their installed locations, it would be VERY VERY appreciated

Thanks ahead of time!

-Chuckster

09-12-2005, 12:38 PM	#2
blazerparts No,I DON'T have Tourett's Join Date: Mar 2005 Location: Reno, NV Posts: 556	the long one in the top pic looks like the vacuum for the trans.......if you have auto __________________ '72 K5 CST 350/350 Daily Driver '69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck '69 GMC 2500 L6292, 3spd beater

09-12-2005, 12:39 PM	#3
panhandler62 Java Mechanic Join Date: Jun 2005 Location: Martinsburg, WV Posts: 6,764	In the first picture you have two vacume fittings.. the small one looks like the signal line for the distributer and the second like it might be for a PCV fitting. I'm not sure what the gizmo in the second pic is. __________________ Keith 11 Lincoln MKT -- Momma's wagon 13 G37xS -- middle age crazy car 68 C20 Fleetside -- RIP Decorating the whole town up at a cost of $27 ....

09-12-2005, 01:13 PM	#4
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	Ok, so C = Trans vaccum line B = PCV? A = ????? What about the manifold stud/bolt? Anyone know where they can be gotten? __________________ Chuck 1972 C-20 Longhorn 402 BB .030" over (409?), curved HEI, RV cam, quadrajet, dual 3" exhaust, TH 400 ported w/shift kit 1999 K1500 Suburban (old style) 5.7L Vortec 4L60E "No matter where you go, ........ there you are"

09-12-2005, 01:23 PM	#5
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	A=Vacuum advance from carb to dizzy B=Crankcase ventilation but not the PVC valve. Goes to fire arrestor spacer that sits on top of carb to RH valve cover __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

09-12-2005, 01:52 PM	#6
Frizzle Fry Registered User Join Date: Aug 2005 Location: Hillsboro Oregon Posts: 6,449	I just installed headers and I used a long bolt with two nuts on it where you are describing. One nut to tighten the header flange, and the other to sandwich the PS pump bracket with the bolt head. Edit: The manifold had the same bolt with a spacer instead of the nuts. Last edited by Frizzle Fry; 09-12-2005 at 02:14 PM.

09-12-2005, 12:34 PM	#1
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	Big block parts identification - can you solve this? Hey there my big block bretheren, It has been three years since I took it apart and now she is going back together and back into the longhorn. Only problem is, it has been a while and I can not remenber what these parts are for. Can you tell me what they are? Also, I am trying to find a replacement exhaust manifolt blot/stud for teh left front hole that the PS bracket attaches to. anyone got one, or know where I can find one? Much thanks in advance me amigos! -Chuckster __________________ Chuck 1972 C-20 Longhorn 402 BB .030" over (409?), curved HEI, RV cam, quadrajet, dual 3" exhaust, TH 400 ported w/shift kit 1999 K1500 Suburban (old style) 5.7L Vortec 4L60E "No matter where you go, ........ there you are"

09-12-2005, 03:02 PM	#8
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	Thanks Thanks all for the parts ID info, and the suggestion for the PS bracket stud. I am really trying to make it look OEM, though, so I am trying to locate a bolt/stud that looks like the one in the illustrated parts book. tThis is a crude drawing, but it shows what I am talking about. It must have gotten lost when it was being rebuilt. Gotta find a replacement. Any ideas men? __________________ Chuck 1972 C-20 Longhorn 402 BB .030" over (409?), curved HEI, RV cam, quadrajet, dual 3" exhaust, TH 400 ported w/shift kit 1999 K1500 Suburban (old style) 5.7L Vortec 4L60E "No matter where you go, ........ there you are"

09-12-2005, 05:07 PM	#9
acloco Registered User Join Date: Apr 2004 Location: Nebraska Posts: 335	B is the fresh air side of the PCV valve - breather in factory air filter housing. Spark arrestor type is longer and has one more bend in it....had to go under the air cleaner. The stud you are looking for...harder than heck to find....try GM parts.

09-12-2005, 07:08 PM	#10
kelsfine69 18 Till I Die Join Date: Mar 2005 Location: Alberta, Canada Posts: 1,522	I also had a hard time finding that stud/bolt. Go to a big truck wrecker, 3 ton , schoolbus....etc.........I found a lot on a bus with a 427BB __________________ 2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home...

09-12-2005, 07:47 PM	#11
demi Registered User Join Date: Sep 2003 Location: Arizona Posts: 305	You Could try here - ClassicIndustries.com Part #1256624

09-12-2005, 10:42 PM	#12
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	Dude, thanks Hey guys, do any of you have any pictures of all the hose routings on your BB's? I don't know why I did not ask about this sooner, but it makes sense. My rig is trying to be totally OEM, so if you have any pictures of teh hoese and tubes we just described while in their installed locations, it would be VERY VERY appreciated Thanks ahead of time! -Chuckster __________________ Chuck 1972 C-20 Longhorn 402 BB .030" over (409?), curved HEI, RV cam, quadrajet, dual 3" exhaust, TH 400 ported w/shift kit 1999 K1500 Suburban (old style) 5.7L Vortec 4L60E "No matter where you go, ........ there you are"



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