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107614 Posts in 12512 Topics by 4812 Members
Latest Member: oldbop88
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61  Camaro Research Group Discussion / General Discussion / Re: NCIB on: February 16, 2013, 02:27:36 PM
Anybody can run the NICB report that indicates prior damage or loss - are you saying that NCRS can run the NICB report that shows the delivering dealer?
62  Camaro Research Group Discussion / Originality / Re: Leaf Spring code? on: February 13, 2013, 02:25:31 PM
Interesting that 5140 has a fairly high chrome specification and would commonly fall into the stainless steel range.  I'm thinking that they must have hugged the lower allowable range of chrome though based on the way these springs rusted!
63  Camaro Research Group Discussion / Originality / Re: Leaf Spring code? on: February 11, 2013, 01:29:22 PM
Makes sense - thanks John
64  Camaro Research Group Discussion / Originality / Re: Leaf Spring code? on: February 09, 2013, 08:30:26 PM
It may just be imbedded in the sizing roller - so every full length of stock gets embossed at equal intervals.  When the full lengths are cut to rough leaf size - some pieces retain the embossing and some don't (depending on where the full length of stock was cut).  Just a thought....
65  Camaro Research Group Discussion / Originality / Re: Leaf Spring code? on: February 09, 2013, 03:34:20 PM
Thanks for the info.  As I'm cleaning them up, I noticed that 3 of the passemger side individual leafs have the "GMU" (or GMC) mark & 4 of the leafs on the driver's side have it.  The smallest leaf on both sides doesn't have it.  I've taken apart a lot of these cars & never noticed that little stamp before :-)
66  Camaro Research Group Discussion / Originality / Leaf Spring code? on: February 09, 2013, 11:28:47 AM
I decided to freshen up my '69 Pace Car for my winter project.  This car gets driven a lot, so the old resto is starting to show its age.  I was cleaning up the leaf springs and noticed a "GM" stamping with a "U" beside it on the main leaf.  Not sure if it's the original leaf spring or not - has anyone seen this before?  Is the "U" a spring code?  They are 5 leaf springs.

67  Camaro Research Group Discussion / General Discussion / Re: Build Quality in the Muscle Car Era on: February 05, 2013, 11:41:24 AM
I couldn't believe the poor quality of welds on my 1970 Challenger!  IMO GM was way ahead of both Ford and Chrysler in production & assembly operations.  Chrysler engines and transmissions were great though.
68  Camaro Research Group Discussion / General Discussion / Re: building a garage on: February 04, 2013, 08:34:51 AM
Hey Gary - Sorry for the delay in response to your question about the dimensions of my building.  It's about 60' wide x 75' deep.  The work bay is isolated from the general population, but there is a garage door in the rear of it so that cars can be moved in & out of the work area (roll-eze) without having to go outside in the rain or cold.  One of the design criteria was that all 8 cars must be able to be driven in & out without having to move other cars.  Hope this helps!
69  Camaro Research Group Discussion / General Discussion / Re: mecum Kissimmee on: January 26, 2013, 05:16:03 PM
I drove up for Friday and Saturday at Mecum - huge crowds both days.  NCRS meet across town was very well attended too.
70  Camaro Research Group Discussion / General Discussion / Re: Can This be correct ? Cast date vs production date on: January 22, 2013, 05:44:52 PM
I don't know about this particular block, but it's kinda surprising that we don't see more of of these big gaps between cast dates and block assembly dates.  Unmachined castings that were placed in inventory at the metal casting plants were "first in - last out".  Digging them out of inventory was particularly problematic in the cold weather months.
71  Camaro Research Group Discussion / General Discussion / Re: BLOCK CAST DATE VS PAD STAMP DATE on: January 08, 2013, 06:25:08 AM
#2 mold line at Tonawanda cast small blocks - they could have (and were at times) shipped to Flint for solid lifter application.  All cylinder iron (both plants) was the same spec.   We did some really unusual alloying for some siamese bore race blocks.  Special alloying just wasn't done in production though - too hard to keep track of with 2,500 tons of iron being poured per day.
72  Camaro Research Group Discussion / General Discussion / Re: BLOCK CAST DATE VS PAD STAMP DATE on: January 07, 2013, 02:37:55 PM
At Tonawanda we never alloyed production castings with nickel.
73  Camaro Research Group Discussion / General Discussion / Re: BLOCK CAST DATE VS PAD STAMP DATE on: January 07, 2013, 07:16:25 AM
It would take a lot of typing to fully answer the metallurgical control question.  Suffice it to say that the primary alloying & adjusting elements were Carbon, Silicon, Manganese, and chrome.  "Base" iron was melted and the alloy composition was adjusted in the hot metal cranes as they were filled from the holding furnaces (in front of the cupolas).  Further adjustments were made at the individual molding lines.  There were only two basic types of iron.  Blocks & drums required a higher chrome for wear and/or tensile (class 30 iron).  Carbon, silicon, and chrome were further adjusted at the mold lines (as the metal was poured into the pouring ladles) for additional strength, and casting feeding requirements.  Gray iron producers were cupola melters back then, so Manganese was used to "tie up" excess sulfur in the iron.  Foundry metallurgy was essentially controlled/analyzed by eutectometers (carbon & silicon analysis via cooling curve) and chill samlpes (carbide tendency).  The full lab with spectrometer, Leco, wet lab, and mechanical testing was located at the forge (next door to the foundry) - connected via pneumatic transport tube.  Believe me - that's the "cliffs notes" version!
74  Camaro Research Group Discussion / General Discussion / Re: building a garage on: January 02, 2013, 06:55:04 PM
Lancaster, PA area - best to contact me through email.
75  Camaro Research Group Discussion / General Discussion / Re: building a garage on: January 02, 2013, 07:15:09 AM
Any members who want to stop by are always welcome.  I love to talk to "car guys" & the refrigerator always has a a few beers in it!  Cars in this building are:  3  copo Camaros (one Yenko), Plum Crazy Hemi Challenger, 427/400 Corvette,  MIV AC Cobra (in SAAC registry), Z11 bb Pace Car, & Mustang GT convertible (daughter's first car).
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