196
Originality / 1970 Camaro Hurst shifter question
« on: January 26, 2008, 10:21:22 PM »
Does this look like an original 70 Z28 shifter? what should be the four digit number for the handle?
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197
Originality / Re: 309 masters on ebay
« on: January 25, 2008, 01:05:27 AM »
The original 1969's are 7/8" and the carsflash master is 1 3/8"
198
Originality / Re: 309 masters on ebay
« on: January 25, 2008, 01:01:55 AM »
The center one is the carsflash one I bought from ebay, the others are original. Do you see the difference?
201
Originality / Re: Yellow marking on smog pump
« on: January 05, 2008, 11:41:28 AM »Quote
The A.I.R. pump isn't the subject of those pages - it's just background. All 1968 applications that used the relief valve on the A.I.R. pump (L35, L78, Z28, etc.) show the valve separately as an assembly plant-installed item; in 1969, no relief valve was used, and it's not called out in the 1969 A.I.M. for installation for any application. Those pages were re-drawn (rather than carrying over the illustrations from '68) due to the completely new 1969 accessory drive system which relocated the alternator and A.I.R. pump from their previous 1968 locations.Just out of curiosity I followed your same analysis for the 1969 Corvette AIM.
If you look in L78, sheet A2, under 6T (which is the A.I.R. pump), it says "assembles same as RPO L35; if you go to L35, sheet A2, under 6T, it says "assembles same as production". If you go to UPC 6, sheet A6 (the production A.I.R. pump installation), there's no callout for installation of the relief valve, as none was used in '69 (although the background illustration shows it on the pump). Some component illustrations are more accurate than others - depends which illustrator drew it; their focus was installation and fasteners, not detail appearance of the part.
Observation of hundreds of known-original cars has confirmed that the relief valve wasn't used in 1969 (although it's present on some Service replacement pumps, which cover a number of different applications).
Under UPC L71, 6T assembles same as Prod.
Under UPC L88, 6T assembles same as RPO L36
Under UPC L36, 6T assembles same as production
Under UPC 6, sheet A3, no callout for use of relief valve, in fact same part number as in the Camaro AIM. Want to note that drawings all have relief valve pictured.
No callout for relief valve in AIM therefore should be no Corvettes with relief valves and yet there are documented examples of L71 and L88 will the valves as noted in Dobbins books.
Is it possible that GM intended for the production pump in 1969 to be the one with the relief valve and then changed course? This would explain the AIM's.
202
Originality / Re: Yellow marking on smog pump
« on: January 04, 2008, 05:05:18 PM »
Thanks, excellent analysis
203
1969 - Orphans / Re: 19N559807 Muncie Case
« on: January 04, 2008, 12:54:00 PM »
that's close, never know what might turn up on this board.
204
Originality / Re: Cowl Hole for Induction wiring
« on: January 03, 2008, 11:56:50 PM »
can you post it?
205
Originality / Re: Yellow marking on smog pump
« on: January 03, 2008, 09:54:14 PM »
I could be wrong but the drawings on page 311 and 312 of the 1969 Camaro AIM appear to have been redrawn as they have the different configuration from the 1968 L78.
206
Originality / Re: Yellow marking on smog pump
« on: January 03, 2008, 01:42:34 AM »
You may be correct about the configuration. Nobody has offered an understanding on the discrepancy in the 1969 Camaro AIM. The 1969 Corvette AIM pictures the relief valve for the L71 and in Dobbins book the 1969 L71 and L88 has the relief valve pictured. So in 1969 Chevy used the relief valve on some solid lifter cars but not on the solid lifter Camaros. I wonder why?
207
Originality / Re: Yellow marking on smog pump
« on: January 02, 2008, 05:52:17 PM »
although the date on the pump reads July 18,1968, and could be originally on a very late 1968 Camaro, my guess would be more likely the complete setup pictured (pulley is 458DA) was on a early 1969 model year.
208
Originality / Re: Yellow marking on smog pump
« on: January 02, 2008, 03:45:29 PM »
Which Chev model would this setup belong to?
209
1969 - Orphans / Re: 19N559807 Muncie Case
« on: January 02, 2008, 12:43:02 PM »
More info: Bought case at Toronto swap meet. GM in Oshawa has no info on the VIN therefore was American sold car.
210
Originality / Re: 1969 z28 Driveshaft (early build 10d)
« on: January 01, 2008, 06:10:43 PM »I am trying to decode the numbers that are cast into the end of my driveshaft.If this is a original z28 driveshaft would the 1969 L78/M20/410 use the same driveshaft casting number 3790024? If not what would the Casting be?
The numbers are 3790024.
The chevrolet symbol is also cast under those numbers.
Are the numbers, the chevrolet symbol, and the stripes consistent with an original
driveshaft.
The yoke ends are also offset.
I have included some pictures to help the decoding.
asm69