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Author Topic: 69 Z28 Distributor Hold Down clamp  (Read 3052 times)
rally
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« on: December 31, 2010, 09:07:47 AM »

Gentlemen what did the factory Z Points distributors use for a hold down clamp? Was this clamp used thru out Chevys production line? I see one on ebay that looks like the right one. Any help would be greatly appreciated. Thank You
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JohnZ
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« Reply #1 on: December 31, 2010, 11:55:08 AM »

Mine has the single heavy-gauge stamped fork-type clamp (not the two-piece formed wire clamp).
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'69 Z/28
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rally
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« Reply #2 on: December 31, 2010, 03:59:53 PM »

Thanks John, appreciate the info. The one on ebay looks like the one you have described and have. Happy New Year.
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My68SS
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« Reply #3 on: December 31, 2010, 10:34:42 PM »

Hi John, was that style of one piece clamp only a Z thing, with others receiving the two piece wire and saddle?
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Rob
1968 L34/M40 SS
12 bolt posi 3.55
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68camaroz28
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« Reply #4 on: January 01, 2011, 12:36:45 AM »

Hi John, was that style of one piece clamp only a Z thing, with others receiving the two piece wire and saddle?

Know our 69 L78 Nova had the one piece clamp like on John's Z and our 69 SS350 has that type as well if I remember correctly.
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Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584
JohnZ
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« Reply #5 on: January 01, 2011, 10:31:10 AM »

Hi John, was that style of one piece clamp only a Z thing, with others receiving the two piece wire and saddle?

I don't know that anyone has ever tied that one down to a specific period for either style; Jerry and folks who have seen lots of known-original cars probably have better guidance.
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'69 Z/28
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Charley
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« Reply #6 on: January 01, 2011, 07:39:18 PM »

On my ZL1
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Jerry@CHP
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« Reply #7 on: January 02, 2011, 01:15:41 AM »

Last year for the wire style distributor hold down was 1968.  As a matter of fact, in the Nov 1968 issue of SSDI they talked about how the wire style hold down clamp would not hold the distributor in place while road testing a 1968 Z28.  Jere Stahl had to keep resetting the dist for the road test.

Jerry
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68rs327conv
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« Reply #8 on: January 03, 2011, 06:36:04 AM »

Would the wire style clamp on a base engine with painted intake be painted also or just plated metal?

Mike
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Mike
68 RS Conv 327/210hp, Powerglide Factory AC
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« Reply #9 on: January 03, 2011, 09:45:03 AM »

To my understanding all were painted Orange except the ones on Aluminum intakes.
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Daniel  
'69 SS 350/4 speed  Fathom Green--POP
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« Reply #10 on: January 03, 2011, 11:08:27 AM »

So the engine was painted after the distributor was installed, can anyone else confirm

Mike
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Mike
68 RS Conv 327/210hp, Powerglide Factory AC
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« Reply #11 on: January 03, 2011, 11:19:59 AM »

Read this and look at the pictures of the engines in the racks. It shows the distributors already in the engine and they're painted.

http://www.camaros.org/assemblyprocess.shtml#chev
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Daniel  
'69 SS 350/4 speed  Fathom Green--POP
Charley
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« Reply #12 on: January 03, 2011, 07:45:28 PM »

Orig hold down of a 69 low hp Camaro I have. Painted and the underside overspray idndicates it was painted on the engine.
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JohnZ
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« Reply #13 on: January 04, 2011, 01:58:45 PM »

Orig hold down of a 69 low hp Camaro I have. Painted and the underside overspray idndicates it was painted on the engine.

That's exactly what I'd expect to see - a coffee can was placed over the distributor to mask it, and at least some overspray will typically show on the collar and hold-down clamp.
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'69 Z/28
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My68SS
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« Reply #14 on: January 05, 2011, 08:27:51 AM »

So from Jerry's observations, it would seem that we at least have all 67's, 68's and early 69's using the wire clamp, then changing to the stamped steel clamp, with the changeover possibly somewhere early 69.
In any event, the wire clamp on my 12c built 68 would seem right. [whew!] Smiley

Perhaps other early 69'ers could chime in with what's on their motor to see if we can narrow down the changeover date.
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Rob
1968 L34/M40 SS
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« Reply #15 on: January 05, 2011, 10:08:11 AM »

So from Jerry's observations, it would seem that we at least have all 67's, 68's and early 69's using the wire clamp, then changing to the stamped steel clamp, with the changeover possibly somewhere early 69.
My 1968 07c Z28 has the stamped steel.
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Jerry G.

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Charley
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« Reply #16 on: January 05, 2011, 10:59:33 AM »

Just for more info..On my 70 Z28 you can clearly see the hold down and bolt were painted silver.

http://www.1970z28camaro.com/engine/#
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My68SS
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« Reply #17 on: January 05, 2011, 11:04:26 AM »

]My 1968 07c Z28 has the stamped steel.
Interesting...the only theory I can think of to make this fit with Jerry@chp's info is that the Z SSDI road tested was an even earlier build with the wire clamp.
There are some unknown variables of course. We don't know exactly when the SSDI road test took place, only that it was before Nov 68 and the build date of the tested 68 Z is also unknown.
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Rob
1968 L34/M40 SS
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My68SS
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« Reply #18 on: January 05, 2011, 11:17:05 AM »

Just for more info..On my 70 Z28 you can clearly see the hold down and bolt were painted silver.

http://www.1970z28camaro.com/engine/#
JohnZ, do you know the assembly procedure for motors with Ali intake? Was the intake fitted by the engine plant, or was the whole valley area covered off and the intake and dizzy fitted later on the engine dress line?
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Rob
1968 L34/M40 SS
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Build - 12C
JohnZ
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« Reply #19 on: January 05, 2011, 12:29:20 PM »

Just for more info..On my 70 Z28 you can clearly see the hold down and bolt were painted silver.

http://www.1970z28camaro.com/engine/#
JohnZ, do you know the assembly procedure for motors with Ali intake? Was the intake fitted by the engine plant, or was the whole valley area covered off and the intake and dizzy fitted later on the engine dress line?

Silver overspray is typically found on Flint engines with aluminum intake manifolds, as there was a silver touch-up type process where silver was sprayed on the exposed cylinder head area between the intake manifold and the valve cover so that area wouldn't rust before the car was sold; during the initial orange painting, the aluminum intake manifold and aluminum valve covers were masked with a vacuum-formed plastic shield, so little or no orange paint got on that area, which would rust quickly without additional painting. All intake manifolds and distributors were installed at the engine plants. We see a lot of this silver overspray on Corvette engines, as most of them had aluminum intakes and valve covers.
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'69 Z/28
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« Reply #20 on: January 05, 2011, 06:27:47 PM »

leave it to john to come up with the right answer!
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69 x77 burnished brown, 711 int 05A bought in 78
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