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109196 Posts in 12646 Topics by 4861 Members
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781  Camaro Research Group Discussion / Restoration / Re: Correct '69 L-78 front springs? on: September 15, 2007, 07:22:19 AM
Heres the GM spring selection charts for the 69 Camaros.  The list shows you the two letter spring code that corresponds to the tag that was on the springs.  There is another pair of charts that turns the letter code into the GM Service part number.
782  Camaro Research Group Discussion / Restoration / Re: Correct '69 L-78 front springs? on: September 14, 2007, 11:06:05 AM
Except for the 4 leaf rear spring on Z28's (which could be used on other cars with the righ combination of options) there is really no such thing as a big block L78 or L35 or L48 spring.  In 69 springs were selected by a computer based on the vehicle type (coupe or convertible), engine type (L6 or V8) and the options added to the car.  This was due to the federal bumper height requirements and GM's need to keep the bumper height within a fairly tight band.  You can get a GM part number for the front and rear springs by adding up your options, but I don't know of anyone who has correlated them 1 for 1 to the moog springs that most of the aftermarket places sell.  Eaton can probably do it though.
783  Camaro Research Group Discussion / Restoration / Re: Help! electrical question? on: September 11, 2007, 08:30:22 PM
Those are the two leads to the factory ammeter on the console.
784  Camaro Research Group Discussion / General Discussion / Re: 1969 Monthly Production Totals on: September 05, 2007, 05:54:40 PM
Because production was supposed to end around the end of July and the dealers weren't taking as many orders.
785  Camaro Research Group Discussion / Originality / Re: 1967 REAR SPOILER NUTS on: September 05, 2007, 05:46:45 AM
They could have, but who knows what kind of nut each dealer would use?
786  Camaro Research Group Discussion / Decoding/Numbers / Re: Please help me with my vin# on: August 31, 2007, 05:28:45 AM

1 = Chevrolet
2 = Camaro
4 = 8-cylinder engine
37 = coupe body
8 = 1968 model year
N = Norwood, OH assembly plant
305832 = vehicle serial number sequence
 
Decode for body number: 005729
 
09A = Built the First week of September.
68-12437 = Coupe.
NOR = Built in Norwood Ohio.
724 = Standard Red Bucket Seats.
A-6 = Lower Color is Tuxedo Black and the Vinyl Top Color is White.
787  Camaro Research Group Discussion / Decoding/Numbers / Re: JL-8 SURVIVORS on: August 30, 2007, 11:36:58 AM
More exist now, that the 206 that left the factory.
788  Camaro Research Group Discussion / General Discussion / Re: Z10 on: August 29, 2007, 05:43:48 AM
Its a real tag.  Can't tell if it belongs on that car or not.
789  Camaro Research Group Discussion / Originality / Re: Transmission type in Z/28 package-1969 on: August 19, 2007, 09:52:16 AM
If the M20 in the trunk has the cars VIN stamped on it, the rear end is a 12 bolt  BU coded axle with 4 leaf springs, power font disc brakes  and there is a single fuel line under the car then chances are its a Z28.
790  Camaro Research Group Discussion / Originality / Re: 67 with A/C and gauges on: August 19, 2007, 09:44:58 AM
Not on a 67 though.  It didn't come from the factory that way rear console mount 8 tracks are 68/69 only.
791  Camaro Research Group Discussion / General Discussion / Re: Factory AC upgrade from R-12 to R-134a? on: August 13, 2007, 11:16:49 AM
No, operating pressures are roughly the same between R12 and R134 and is controlled by the thermostatic valve, the POA valve and the ambient temperature outside.  R134 would like to see about 29 psi on the low pressure side to give you the same vapor pressure that R12 will give you at 34 psi.  Remember your POA controls the low pressure setpoint, so it will try to maintain around 34 psi in the evaporator which will prevent the R134 from getting as cold as the R12.  In either event the difference in operating pressures between the two is insignificant.
792  Camaro Research Group Discussion / Originality / Re: 69 Camaro X codes, did they make SS's without them in june? on: August 12, 2007, 07:25:12 AM
The TH400 codes are on a tag about 2" square riveted to the transmission on the passenger side.  Should start with the letter a C followed by another letter then 4 or 5 digits.
793  Camaro Research Group Discussion / General Discussion / Re: Factory AC upgrade from R-12 to R-134a? on: August 12, 2007, 07:22:02 AM
If your going to use R134 you need to replace the dryer with one thats designed for R134, you need to remove your compressor and drain ALL of the oil in it as the PAG oil used in R134 equipment is not compatible with the mineral oil used in the older systems.  Refill the compressor with PAG oil, (not really sure how much it takes)  You should also flush the rest of the system to get any remnants of the oil and refrigerant out (but I didn't do that an mine works fine).  After that you need to draw a vacuum in the system to get any moisture out and hold that vacuum for at least an hour although longer is better.  After that you just need to add 54 oz (give or take) of R134 to the system and you should be good to go.  Run the car at about 2000 rpm with the controls on max A/C and fan on high.  You want the low pressure side to be around 34 psi and the high up around 250 psi (but this varies due to air temperature)  Once you get up to 48 oz, go slow and watch the sight glass on the top of the dryer for air bubbles.  Once the air bubble stop your full.
794  Camaro Research Group Discussion / Decoding/Numbers / Re: Week definition on cowl tag on: August 06, 2007, 11:21:36 AM
A week is a generally a week in the body code, you just can't say that the A week started on the 1st of the month, or the E (or D) week ended on the 30th of the month. 

Generally the A week of the month is the first FULL calendar week of a month.  For example if the month ended on a Tuesday, then that whole "assembly" week was part of the previous month even though there was only one calendar day in that month.  There are exceptions to that statement, and differences from one assembly plant to another so its not really worth worrying about.  Using the VIN numbers (at least for 69 and later cars) is a much better way of determining when in a month a particular car was built.
795  Camaro Research Group Discussion / General Discussion / Re: Tailpan blackout on 69' tuxedo black SS396? on: August 01, 2007, 07:41:43 PM
Not really buffed, but color sanded and flowed out in an oven.

From the CRG assembly process article:

"Color System: The bodies were sequenced to "batch-paint" by color as much as possible, to minimize the waste of thinner required to clear paint guns between colors. The interior was masked off, the body exterior was tacked-off, and it then entered the first color booth, where it got three coats of acrylic lacquer, sprayed automatically with vertical and horizontal reciprocating spray guns, with a 3-minute "flash" between coats, followed by a 10-minute bake at 200F to "skin" the surface prior to sanding. In the next stage, any surface defects were power- and hand-wet-sanded with mineral spirits, then wiped off prior to entering the final "reflow" oven. This bake lasted 30 minutes at 275F, where the lacquer surface softened and "re-flowed" to a uniform gloss. The last process for a non-stripe car was the blackout booth, where the firewall was blacked-out, the trunk was sprayed with spatter paint, and sound-deadening undercoat material was sprayed in the rear wheelhouses. The rear "cocktail shakers" on convertibles were suspended in the trunk for spatter painting, but weren't bolted in place until later in the Trim Shop, after the taillights and marker lights were installed.

If the car required Z-28, Z-10, or Z-11 stripes or a black rear end panel or rockers, they were masked and sprayed in the in-line repair booth/oven system after the reflow oven, including the cowl vent panel; spoilers were painted and striped separate from the body and were installed before the body went back downstairs to the Trim Shop."

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