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105762 Posts in 12346 Topics by 4757 Members
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4036  Camaro Research Group Discussion / Restoration / Re: 12 bolt restoration on: December 29, 2005, 10:51:22 AM
When we hoisted the axle out of the shipping rack, the cables were crosswise horizontally across the axle, above the diff nose, and held together with a wire tie so they didn't dangle and get hung up in the rack locators; after setting the axle on the chassis carrier and installing the springs and cable guides, we cut the wire tie, routed the cables, and clipped them into the guides. The cables may have been hanging free when the assembly was painted while on the conveyor at the axle plant, then routed and wire-tied before the axle was transferred into the shipping rack.  Smiley
4037  Camaro Research Group Discussion / Restoration / Re: 12 bolt restoration on: December 28, 2005, 11:27:27 AM
The rear axle assembly (housing, tubes, diff, rear cover, backing plates and drums and parking brake cables) was painted at the axle plant as a completed assembly just before it was placed in the shpping rack; the brake pipes and center block were installed later at the car assembly plants.
4038  Camaro Research Group Discussion / Originality / Re: Battery Ground lead on: December 28, 2005, 11:18:48 AM
Arno, maybe someone more familiar with the detail of 68's can respond; I pretty much focus on 69's.
4039  Camaro Research Group Discussion / Originality / Re: Battery Ground lead on: December 27, 2005, 11:39:19 AM
There should be a pre-pierced hole in the vertical wall of the fender reinforcement for that screw - it wasn't drilled at assembly.  Smiley
4040  Camaro Research Group Discussion / Maintenance / Re: Original vented gas cap on: December 25, 2005, 12:58:43 PM
Yes, the "vented" cap has a pressure/vacuum valve in it, and if the tank hasn't reached the threshold for the valve, it will "hiss" when you remove the cap to refuel.  Smiley
4041  Camaro Research Group Discussion / Originality / Re: 1969 z/28 ignition coil (early z/28 october 1968) on: December 25, 2005, 12:54:53 PM
Not positive on the Camaro, but the NCRS guide calls out the 1115270 for the '68-'70 Corvette 300 & 350hp engines with point ignition, and that's the number embossed on the coil itself.
4042  Camaro Research Group Discussion / Mild Modifications / Re: 302 cam placement on: December 22, 2005, 01:00:55 PM
Advancing the cam timing 4* to pick up some additional low-end torque has varying results, depending on the cam; this works quite well on the Chevy "151" (327/350hp hydraulic) cam, but the duration/overlap of the "30-30" Z/28 cam is so extreme, advancing it makes little difference in low-end torque. A far better solution is to swap it for the Chevy factory LT-1 solid-lifter cam; that cam will produce about a 20% increase in low-end torque over the "30-30", with almost no trade-off above 6000 rpm. The LT-1 cam is available from GM as a kit with lifters under GM P/N 12364054 for less than $150.00, and from Federal-Mogul/Speed-Pro as a kit with lifters under their #KC-1145R for a little less.  Smiley
4043  Camaro Research Group Discussion / Restoration / Re: 302 heads on: December 22, 2005, 12:49:51 PM
482 heads came with 1.72/1.5 valves and small ports and it would be a waste to put bigger valves in them due to the port restrictions. 462 heads came with both 1.94/1.5 and 2.02/1.6 valves (just as 186's did), but if you take a 462 or 186 head with 1.94's and open them up to take 2.02's and don't also make the unshrouding cut in the chamber wall adjacent to the intake valve, they'll flow less than they did with the 1.94's. Photo below of the factory unshrouding cut with factory 2.02 valves.

4044  Camaro Research Group Discussion / Decoding/Numbers / Re: 1969 z-11 casting numbers on: December 22, 2005, 12:34:05 PM
The "Cans" are called "shakers" or "cocktail shakers".  They help stiffen the body on convertibles as the roof is missing.

More to the point, they are vibration dampers - they don't stiffen the body, but they dampen torsional vibrations that occur as a result of the convertible's reduced body stiffness; you'll find two more in front, behind the headlights, and a bolted-on "X-brace" across the bottom of the transmission tunnel, used only on convertibles, that adds back some of the lost body stiffness.
4045  Camaro Research Group Discussion / Originality / Re: 1969 z/28 ignition coil (early z/28 october 1968) on: December 19, 2005, 07:14:50 PM
Be aware that the part numbers shown in the Assembly Manual are for the coil ASSEMBLY, which includes the coil and the mounting bracket (they came from Delco-Remy with the mounting bracket and clamp screw already installed); the coil used with the ZL2 hood had a different ASSEMBLY number because it came with a different mounting bracket (to clear the air cleaner base). I don't have the details handy, but I wouldn't be surprised if the coil itself was the same part number in both applications, with a different ASSEMBLY number due only to the brackets.
4046  Camaro Research Group Discussion / General Discussion / Re: Catalytic converters on 69' Camaro ! on: December 19, 2005, 06:53:23 PM
I live in AZ ,were a few years behind here. This state is not very car friendly , there are alot of nice cars here that don't hardly see the light of day because there are not very many car things to do. Cruising has been outlawed at all the old cruise spots. There are some cruis-ins but only a few and even they disapear from time to time.


Your governor just signed a bill into law about three months ago that exempts classic/collectible cars over 25-30 years old from the emission requirements; isn't it in effect yet?
4047  Camaro Research Group Discussion / General Discussion / Re: Catalytic converters on 69' Camaro ! on: December 18, 2005, 10:44:40 AM
What state do you live in that requires emission testing on a 36-year-old car? Even California doesn't require it on cars prior to 1976.
4048  Camaro Research Group Discussion / Originality / Re: seat belt color on: December 16, 2005, 12:43:10 PM
Same was true in '69 - my Z has the deluxe interior (Z87), but has standard (black) belts; deluxe belts were still a stand-alone option in '69, not tied to any other package.
4049  Camaro Research Group Discussion / Originality / Re: 69 X77 code Camaro Many fact questions. on: December 13, 2005, 01:15:51 PM
The spindle/steering knuckle, steering arm, hub, rotor, bearings, and caliper were received as a complete assembly; J52 power disc brake cars (except Z/28) used P/N 3954867-8 assemblies, and the Z/28's (which had J52 as a mandatory option) used P/N 3954869-70, which were identical except for shorter steering arms bolted to the knuckle.  Smiley
4050  Camaro Research Group Discussion / Restoration / Re: New Shell Vs Fixing mine on: December 11, 2005, 11:49:20 AM
<< Now I suppose GM had tin from the sixties around. I dont think so. If modern tin is so much better why did GM stamp new fenders out of full guage metal. Remember all asian tin is made from the ground up cars and appliances we send overseas. >>

It's not a matter of "having tin from the sixties around" - the print calls for a given sheet thickness, and that's what the draw, trim, flange, and pierce dies are designed to work with. Steel sheet is available in any thickness you specify, and there's nothing "special" about the sheet gauge used in the 60's; many different gauges of steel sheet are used in different parts of the car. Domestic steel isn't "virgin" either - normally it's about 40%-50% recycled material, and has been for decades; the alloying materials are what gives it specific properties.  Smiley
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