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111302 Posts in 12818 Topics by 4913 Members
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3676  Camaro Research Group Discussion / Decoding/Numbers / Re: HEADS/BLOCK/MANIFOLD HELP on: October 13, 2006, 09:28:06 AM
What's the data for the car to match it against? VIN, cowl tag, model year, trans, axle, VIN derivative stamped on the engine, etc. ?
3677  Camaro Research Group Discussion / Decoding/Numbers / Re: Not Camaro but weird build sheet on: October 13, 2006, 09:24:14 AM
Yup, Doraville ran out of pre-printed forms and used forms from Kansas City until theirs showed up from the printer - I posted over there.
3678  Camaro Research Group Discussion / Restoration / Re: Parking lights on: October 12, 2006, 10:12:14 AM
Nothing is wrong - parking lights "on" with the headlights didn't start until the 1968 model year; some guys with 67's later jumpered the terminals on the headlight switch so the parking lights would be "on" with the headlights.
3679  Camaro Research Group Discussion / Restoration / Re: Outer door window felts on: October 12, 2006, 10:09:46 AM
Here's the rear end of an original passenger side outer fuzzy - it's tapered somewhat to round it off, appears to have been done with an abrasive.
3680  Camaro Research Group Discussion / Decoding/Numbers / Re: TRANSMISSION CODDING HELP on: October 11, 2006, 11:20:13 AM
T is Toledo plant, 7 is the model year, E is May, 05 is the 5th, D is day shift.
3681  Camaro Research Group Discussion / General Discussion / Re: 1967 aircond on: October 11, 2006, 11:14:50 AM
Yes - Harrison evaporator box ("suitcase"), and Frigidaire compressor.
3682  Camaro Research Group Discussion / Maintenance / Re: Fuel Lead Additive on: October 10, 2006, 11:59:01 AM
If you have heads with 2.02/1.60 valves, machining for exhaust valve seat inserts can be very risky unless it's done by a shop that REALLY knows what they're doing; 2.02/1.60 heads are prone to cracking in the very narrow region between the valves as it is, and the chamber roof isn't very thick in that area - an inexperienced machinist can easily go through into the water jacket when cutting the recess for the seat insert.
3683  Camaro Research Group Discussion / Maintenance / Re: M20 clutch adjustment on: October 10, 2006, 11:53:05 AM
Nope - as the clutch wears (disc thickness is reduced), the effective length of the lower rod will be reduced - it will get shorter, not longer. As the disc wears, the outer end of the clutch fork moves forward as the ends of the diaphragm fingers move rearward.
3684  Camaro Research Group Discussion / Maintenance / Re: Fuel Lead Additive on: October 09, 2006, 10:06:54 AM
"Lead additives" don't contain lead - it's illegal to sell tetraethyl lead, as it's a strong carcinogen, easily absorbed through the skin. You don't need any "lead additive" - exhaust valve seat recession isn't an issue unless the engine is in a boat or you pull a trailer at 100 mph all day long; all lead additives will do is 1) Lighten your wallet, and 2) Eat the protective plating off the inside of your float bowls (the "additives" are LOADED with alcohol, except Jack Podell's, which is 99.8% kerosene).  Shocked
3685  Camaro Research Group Discussion / Research Topics & Reports / Re: 68 RS center grille on: October 09, 2006, 10:01:33 AM
John, do you have any idea why the ones with the mold cavity numbers don't have a part number too?

Steve

Nope - generally it was optional on the drawing for the part number to appear on the part, unless Engineering had a reason for it to be required.
3686  Camaro Research Group Discussion / Originality / Re: Where are the part #'s ??? on: October 08, 2006, 08:34:08 AM
A good friend of mine retired seven years ago from GM Legal (spent the previous 30 years with Chevrolet Engineering) and was an occasional source for rare Chevrolet drawing, ECR, and Work Order information post-retirement, but since then the "moles" he had at Legal and in the archives have also retired; between that and multiple GM internal reorganizations, those contacts have been lost.
3687  Camaro Research Group Discussion / Originality / Re: Correct Fan and orientation? on: October 08, 2006, 08:26:03 AM
Mark,

BTW, the picture below of my 5 blade fan and clutch shows why I noticed a difference. See how much "fatter" the blades look? And yes, my car has A/C, which explains all the belts in the picture.

You probably already know it, but that's an aftermarket fan clutch.
3688  Camaro Research Group Discussion / Research Topics & Reports / Re: 68 RS center grille on: October 08, 2006, 08:20:14 AM
Steve:

Here are some pics of the center grille.

Paul, as someone who has been in the injection molding business for 22 years I look at the small numbers you see on the back side of the headlicht covers and say they were mold cavity numbers. JohnZ may be able to verify this?

Mark

I agree - generally if there are individual numbers or characters molded into the back side of an injection-molded plastic part, they're mold cavity identifiers.
3689  Camaro Research Group Discussion / Decoding/Numbers / Re: Stamping question... Hidden Vin ??? on: October 08, 2006, 08:12:07 AM
If I'm not mistaken did'nt fisher use a different coding system than chevrolet did.

Fisher didn't stamp the hidden VIN - it was done by Chevrolet in the first station on the Chevrolet hard trim line.
3690  Camaro Research Group Discussion / Restoration / Re: Correct locaton of proportionong valve on sub frame on: October 07, 2006, 11:56:09 AM
I can't explain why Chevy named them the way they did, but functionally, the one on the frame is a true proportioning valve (and its function was later incorporated into the "combination valve" that combined proportioning, front metering, distribution, and differential pressure switch functions in the mid-70's). The round one under the master cylinder has no proportioning function - it just remains closed until its inlet sees 30-40 psi, then it opens and allows fluid pressure to the front discs.

The function of the round metering valve (or "hold-off" valve) is to allow the rear system to see 30-40 psi (which moves the rear drum shoes out into contact with the drums) before the front discs see any pressure, to avoid disconcerting "front brakes first" on pedal application, which causes "nose-dive" at low speed. The metering valve on my '69 Z/28 is stuck open (needs a rebuild), and at low speed light brake application the car nose-dives and feels like it'll stand straight up on its nose when you step on the brakes. Gotta rebuild it this winter if I can find the correct kit with ALL the seals.
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