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| | |-+  What is the assembly line correct 68 Rochester 4-bbl carburetor choke pull-off?
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Author Topic: What is the assembly line correct 68 Rochester 4-bbl carburetor choke pull-off?  (Read 4318 times)
bowtie68iho
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« Reply #15 on: May 21, 2012, 05:07:48 PM »

Jeff68,

Your last post with pictures complicates things, now.  I'm not sure how to proceed with the fuel inlet nut issue.  My GM documentation (provided with my May 17th post to this thread) shows my nut and your replacement nut (your earlier picture on May 16th) as the original nut.  Yet, your latest picture of your original nut looks different than the pictures I have of what is supposedly an original nut.  Could there be two acceptable fuel inlet nuts from different vendors? 

Because we seem to be at an impasse, can JohnZ, Pacecarjeff, or any of the judges chime in?  Thanks.

Bernie
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68 NOR SS/RS L48/M35 Convertible
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jeff68
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« Reply #16 on: May 21, 2012, 08:39:25 PM »

Just double-checked and my original Rochester choke pull-off doesn't have any markings on it.
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68 L30 / M20 Convertible
Ash Gold
1968RSZ28
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« Reply #17 on: May 22, 2012, 02:00:28 AM »

I'll check my stash of carbs in the morning.  I have a few QuadraJets I pulled from L30 & L48 Camaros in 1980.

Paul
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67 RS Ragtop
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« Reply #18 on: May 22, 2012, 05:21:51 PM »

FWIW.  I have an early 67 with the Carter built Quadrajet (7027202 DB, K6), and the pull-off bracket has no part numbers stamped on it, and the original pull-off was all white, with no RP markings on it. If you need more info, I can provide pics. I also have a pic of the original fuel inlet nut, which was replaced (due to bad threads) by a Self tapping nut that looks very much like the one you have been discussing. Mine of course is 5/16 line size (first design).
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67 RS Ragtop
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« Reply #19 on: May 22, 2012, 05:39:21 PM »

I also have a '68 Carter built Quadrajet (7028212 DH, B8) that has no numbers on the pull-off bracket, but, the pull-off itself is the silver and black RP pull-off, with a 52768 on the cover. Again if you need pictures I can supply them. Both carbs appear to have the original pull-offs that they were manufactured with.
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1968RSZ28
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« Reply #20 on: May 22, 2012, 11:25:50 PM »

I'll check my stash of carbs in the morning.  I have a few QuadraJets I pulled from L30 & L48 Camaros in 1980.

As promised, here are a few photos of a Rochester Quadrajet I pulled from a car on 6-20-80.  My tag on the carb reads: 1968 Camaro SS350 with Powerglide.  The carb ID number is 7028212 DH with a date code of 1188.







Paul
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JoeC
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« Reply #21 on: May 23, 2012, 08:46:23 AM »

interesting that one has the all plastic vac but has the metal kickdown lever

I think the red plastic kick down is original, I have seen cracked originals

they may have had problems with the original plastic parts , it looks like replacements used more metal parts
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bowtie68iho
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« Reply #22 on: June 13, 2012, 05:30:34 PM »

Paul (1968RSZ28),

I found yet another official GM source (see attached) that confirms the fuel inlet nut on my 7028212 Rochester 4MV (4 barrell) carburetor as being correct...the photo of my carb was in my opening thread on May 15, 2012.  My fuel inlet nut is the same as the one in the attached GM document, the photo that Jeff68 posted in this thread on May 16, 2012, and the photo that you posted in this thread on May 22, 2012.  The attached GM documentation supports the other three GM documents that I posted in this thread on May 17, 2012.

-Exploded view of a Rochester Carburetor Model 4MV (327 & 350 cubic inch engines) Float Bowl, Figure 35R on Page 6M-20, from a "1968 Chevrolet, Chevelle, Camaro, Chevy II and Corvette Chassis Overhaul Manual. (dated 1967)"  Illustration #11.

In relation to your last comment about the fast idle cam (aka "kickdown lever"), the attached document shows it looking like the plastic version, not the metal one.

Bernie

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68 NOR SS/RS L48/M35 Convertible
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1968RSZ28
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« Reply #23 on: June 13, 2012, 05:54:13 PM »

Paul (1968RSZ28),

In relation to your last comment about the fast idle cam (aka "kickdown lever"), the attached document shows it looking like the plastic version, not the metal one.

Bernie

Bernie,

That's wasn't me...

interesting that one has the all plastic vac but has the metal kickdown lever

I think the red plastic kick down is original, I have seen cracked originals

they may have had problems with the original plastic parts , it looks like replacements used more metal parts

 Smiley

Paul
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bowtie68iho
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« Reply #24 on: June 13, 2012, 06:09:49 PM »

Oops! I guess I should have said JoeC's last comment.  My bust.
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Ed Bertrand
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« Reply #25 on: June 13, 2012, 06:30:57 PM »

Bernie, read THIS before you commit.

Ed
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bowtie68iho
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« Reply #26 on: June 13, 2012, 07:44:47 PM »

Thank you, Ed.  I wasn't going to commit before getting a nod from a Legends Judge first.

It would be good to know for the entire Camaro restoration hobby what holds more credibility for an "originality" argument, a person's memory (or the collective memories of multiple people) from 40+ years ago, or period-dated published documents and/or photos from the original manufacturer?  I know what holds up better in a court if law, but not what is acceptable by car show judges.  I at least presented evidence that would sway a legal opinion (if this were a court, but it's not) using the "preponderence of the evidence rule" (a >50 percent convincing argument).

I would hope car show judges would uphold the proverbial "tie goes to the runner" baseball concept when OEM documentation can be offered to support a car owner's claim.  Can the Legends Judges at least go public with an official statement one way or the other, so the entire hobby can benefit from certainty.  We don't have NCRS books like the Corvette guys do.

Bernie
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Mike S
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« Reply #27 on: June 13, 2012, 08:03:41 PM »

Bernie,

 What did the judges say at the show you lost points about the inlet nut...it was too soon or too late in use compared to your car date?
I checked both my 67 BB's and they have the same one you have.

Mike
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67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored
bowtie68iho
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« Reply #28 on: June 13, 2012, 08:32:32 PM »

Mike S,

They didn't tell me the fuel inlet nut was incorrect while I was present at the Nationals.  I found out a week or so later when my scoresheet was e-mailed to me.  If I knew at the Nats, I could have at least had the opportunity to show them documents to argue my point.  I'm guessing that the judges are swamped with other Legends cars to inspect and can't take time to discuss many issues, or they would never finish in time.  They have a lot of work to do in a rather short period of time.

Maybe there needs to be some sort of formal appeals process for deficiencies that are debatible between parties??

BTW, Ed's reply to this thread was also applicable to my recent post (today) on Delcotron stickers.

Bernie
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68 NOR SS/RS L48/M35 Convertible
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DMiller307
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« Reply #29 on: January 27, 2013, 08:12:04 AM »

Not sure you guys know this but to reply to Bernies statement that the tie goes to the runner....  "Little league" baseball rules state that there is no such thing as a tie...   The runner is either safe or out...
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