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Author Topic: 'late' '69 Z28 Valve Cover drippers  (Read 8796 times)
69Z28-RS
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« on: October 27, 2008, 01:54:56 PM »

Is there any evidence to show that 'late' (Sept and later 1969) Z28 valve covers had drippers?   I've owned my car since 1976; it has not been restored.   There was no evidence even when I purchased it that any work had ever been done to it, yet it had 'drippers' in the valve covers.  I'm hypothesizing that perhaps beginning at the time of 'normal '70 production' that the valve covers were updated to the drippers.   Current CRG information seems to claim that all '69 Z28 VC's did NOT have drippers?
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
firstgenaddict
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« Reply #1 on: October 27, 2008, 04:33:52 PM »

makes sense because I have never heard that ANY 70 LT1 corvettes or Dueces had non-dripper covers...
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James
Collectin' Camaro's since "Only Rednecks drove them"
 
Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://picasaweb.google.com/112392262205377424364/1969_Z28_Restoration
68Zproject
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« Reply #2 on: October 29, 2008, 09:10:22 PM »

If you've taken them off you could check the part #s on the bottom.
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68Z28
Jerry@CHP
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« Reply #3 on: October 30, 2008, 08:22:42 AM »

We have restored many sets of valve covers on late cars and they do not have drippers.

Jerry
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jdv69z
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« Reply #4 on: October 30, 2008, 08:35:07 AM »

When Chevrolet changed the design to include drippers, wouldn't the part no. stamped inside these change as well? I'm assuming the drippers would be included in the initial casting process?

Jimmy V.
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Jimmy V.
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« Reply #5 on: October 30, 2008, 08:59:37 AM »

Jerry,
Have you seen any non dripper LT1's or Dueces?
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James
Collectin' Camaro's since "Only Rednecks drove them"
 
Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://picasaweb.google.com/112392262205377424364/1969_Z28_Restoration
69Z28-RS
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« Reply #6 on: October 30, 2008, 03:31:03 PM »

When the design changed, the part number should have changed.  I have early Chevrolet Parts Manuals (69-72 dated) at home which I can check, but I  haven't yet done so.  I will check and see if there is a 'date' associated with the change.
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
69Z28-RS
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« Reply #7 on: October 31, 2008, 12:10:44 AM »

I checked the '69-70 Z28 valve covers I have. I checked 5 different covers; They were all the same; all had drippers and they had stamped inside the following pn's:     
P-3932417-LH  (this number was on only 3 of the covers I have)
P-3965543-LH   (this number was on all)
P-3965544-RH  (this number was on all)

There were also come other numbers stamped :    'C-1'     and   'CBC'   (these numbers were not on all of the covers).   There seemed to be 'two versions' of the PN's....

I also checked the September 1970 Chevrolet Parts Book I have.   For the '69 -70 SHP 302 and 350, the numbers provided were:     3965541-LH and 3965542 - RH.   

I'm curious if anyone has one of the 'non-dripper' VC they can check for the PN stamped inside?
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
Dave69x33
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« Reply #8 on: November 09, 2008, 09:45:10 PM »

Here is a picture of my non-dripper RH cover showing P/N-3932418.  This is off my 05A (May) 69Z.  I looked and I can not find my picture of the inside and part no. of my LH cover.

Years ago, I purchased a set of these covers from GM (service replacements) and they had the drippers.

Questions: What does the "A" stamping stand for?  Also, what does the "C-2" and "CBC" stand for?

Thanks,
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JohnZ
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« Reply #9 on: November 10, 2008, 10:10:22 AM »

Questions: What does the "A" stamping stand for?  Also, what does the "C-2" and "CBC" stand for?

Thanks,

Typicallly, "CBC" is the vendor identification, "C-2" would be a mold number, and the "A" in the circle would be an Engineering change level.
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'69 Z/28
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69Z28-RS
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« Reply #10 on: November 10, 2008, 05:09:05 PM »


Thanks Dave for the information on your RH cover.  It appears that the 'dripper valve covers' were an improved design, and replaced the original non dripper valve covers.  I'd love to find a date associated with the redesign.  I'm suspecting that your non dripper LH valve cover would have the 3932417 which is one of the PN's under the latercovers.   Does anyone have any data supporting the date of that change?

Thanks to John Z for his irreplaceable knowledge (and his sharing it) as always!   Smiley
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
Jerry@CHP
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« Reply #11 on: November 10, 2008, 09:14:41 PM »

Have never seen any LT1 valve covers without drippers.  And we've restored hundreds of original sets.

Jerry
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69Z28-RS
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« Reply #12 on: November 20, 2008, 01:27:44 AM »

Jerry,  I'm taking that you believe the last '69 Z28 (sometime in Nov '69) had non dripper VC's.. and the first '70 Z28 LT1 had dripper VC's?   IS that your belief?   Do you have any GM iinformation that supports such a date for that changeover?
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
Jerry@CHP
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« Reply #13 on: November 20, 2008, 08:48:07 PM »

No info from GM but we have done original 11A Z28 covers and they did not have drippers.

Jerry
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firstgenaddict
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« Reply #14 on: November 20, 2008, 09:24:45 PM »

What is the earliest LT1 set you have done?
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James
Collectin' Camaro's since "Only Rednecks drove them"
 
Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://picasaweb.google.com/112392262205377424364/1969_Z28_Restoration
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