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102521 Posts in 12093 Topics by 4669 Members
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1591  Camaro Research Group Discussion / Research Topics & Reports / Re: Earliest 3969341 and Latest 3894860 axles on: February 20, 2013, 09:11:23 AM
I went back to the CRG data on differentials, and it says the 3 letter code began wtih the '70 model year, and the 'C' represented 'cars' (I supposed as opposed to truck differentials?)..  Given that, it makes sense that at the time they would have normally began building the new model year (late July or August or so?), they would have began using the new parts; as they did for a number of different items on our late '69 cars; several items are labeled as, or carry characteristics of the '70 model year, rather than the '69 model year.
1592  Camaro Research Group Discussion / Decoding/Numbers / Re: '67 vs '69 302 harmonic dampers on: February 19, 2013, 08:21:40 PM
I don't see a picture, but the timing mark on 1968 and earlier balancers is in line with the crankshaft keyway. In 1969, the timing mark was rotated about 10 to 12 degrees toward the Advance (A) mark.
Ed

Thanks Ed,  the keyway to TDC relationships  you describe are consistent wtih the '67 and '69 balancers I have.   The '67 is pictured on the left wtih the '69 on the right.   The '69 has the 7708 stamping, while the '67 has a '1' and a '7', although the numbers appear to be inverted to one another?    What is the coding on a '67 supposed to be?   Both balancers appear to have similar cast in 'codes' on the rear inside...
1593  Camaro Research Group Discussion / Decoding/Numbers / '67 vs '69 302 harmonic dampers on: February 19, 2013, 01:18:16 PM
in digging thru my parts, trying to find all the '69 parts to put my 302 back together, I found a couple of seemingly appropriate harmonic dampers, but there are some differences.   I have identified the '69 302 damper, since I stamped my initials on it when I rebuilt the engine back in the mid 70's, and had the machine shop add grooves at 30, 90, 180, and 270.  It's stamped on the front '7708', which I believe I've read is correct for the '69 Z28.
The other large damper I had, which I believe to be from the '67 302 which I disassembled once upon a time.. Smiley    It only has a '1' and a '7' on the front (see photo).  but I also noticed the keyway vs TDC is not the same as for the '69 damper.   Is one of these weights 'slipped'?  or is there supposed to be a keyway difference?  and if so, why?   If so, I assume the crankshaft keyways are also appropriately different?  Can someone point me to a document that clarifies this?  or perhaps provide clarification here?
1594  Camaro Research Group Discussion / Decoding/Numbers / Re: 67-68 Z28 Crank Pulley pn 3858533 BJ ? on: February 19, 2013, 01:02:56 PM
Yes, that's the way it appears, given the stamped number on the front...   I've also got a couple of questions concerning the difference in damper between the '67 and '69 302, but I'll start a new thread for that.   Since you have a '67 Z28, Jon..  I Hope you can help me out again!  Smiley
1595  Camaro Research Group Discussion / Originality / Re: 69 smallblock (302) Oil dip sticks on: February 19, 2013, 09:30:35 AM

Re: 69 smallblock V8 (302, 307, 350) Oil dip sticks  (reorganizing per Kurt's suggestion)
--------------------------------------------------------------------------------
type 1)   Flattened handle on end, no PN, no plastic tip, stamped "ADD |         | FULL   USE GM 6041-M QUALITY MS OIL   E ".  (E turned 90 deg).
type 2)   Green tip on handle, no PN, no dimple,  stamped             "ADD |         | FULL   USE GM 6041-M QUALITY MS OIL   M ".

Member            Production            Dipstick
                    Plant       Week           Type

jdv69z            NOR        10(68)        flat
firstgenaddict   NOR       10D (68)     flat
LatebuildZ         ??         Nov(68 )     green tip
68CamaroZ28  NOR       11 (68)        green tip
Boston14        NOR        11D (68)     flat
z28z11           NOR         01C            flat
JOHNZ            NOR        02D            flat
Hans L              ??         04B             flat
X77-69Z28      NOR        05A             flat
RSZMJT          NOR        06A             flat
BULLITT65      NOR        08C             flat
69Z28-RS        NOR        09C             flat
LatebuildZ       NOR        10C             flat

Where are the LA cars?? 
Each new poster should copy this and add his information appropriately to the list before posting.



1596  Camaro Research Group Discussion / Originality / Re: 1969 Z/28 motor mounts on: February 19, 2013, 09:10:52 AM
Let's shoot for 'restoration', Steve!!  Smiley
PS.  Are you in Murfreesboro?  I'm just north of Huntsville;  we should try to get together sometime... compare notes!

Gary
1597  Camaro Research Group Discussion / Originality / Re: 1969 Z/28 motor mounts on: February 18, 2013, 11:35:09 PM
Steve,  Were they still functional?  or were they broken apart?  if functional, why did you change them?
1598  Camaro Research Group Discussion / General Discussion / Re: Zl-2 Cowl Hood Production on: February 18, 2013, 12:49:49 AM
and try to find out the date code on his hood? *S*
1599  Camaro Research Group Discussion / Originality / Re: 1969 Z/28 motor mounts on: February 17, 2013, 10:08:50 PM
thanks for the additional photos!   They show a very interesting motor mount design, and also a very complicated one.   I'm pretty sure I've never seen one quite like that, although I did participate in pulling some original engines from Z28's back around '71-'72..  but motor mounts did not get a lot of my attention back then either.. Smiley
PS.  Does the additional height of that mount cause you any other issues, such as the one I had using the '3962748 mount' which caused my header collector to come too close to the bottom of my floor?  Or do you think my problem likely stemmed from either the header fabrication/design, or the trans mount?
1600  Camaro Research Group Discussion / Originality / Re: 1969 Z/28 motor mounts on: February 17, 2013, 03:20:39 PM
Sorry if I offended you; I wasn't doubting what you said, but simply noting that I haven't seen any GM documentation confirming the part numbers.   Is the mount 'locking'?  it didn't appear to be....  but it did seem to have 3 layers of metal, with each pair of metal layers laminated to the next using rubber, which seems to make it very thick?   What is the purpose of the middle metal layer?
1601  Camaro Research Group Discussion / Research Topics & Reports / Re: Earliest 3969341 and Latest 3894860 axles on: February 17, 2013, 02:50:47 PM
Thanks for the photo Sonny.  It's interesting to see how much separation there is in the 'C' and the 'BU'.   Does anyone have any idea why the separation?  stamped separately?  or ??  if so, maybe the 'C' is carrying some other piece of information we aren't aware of?
and seeing the separation, perhaps Kurt was correct, and there 'was' a 'C' before my BU code, but if so, it was apparetly hit by a highway rock, or debris, and became obscured to the point it is no longer clear.
1602  Camaro Research Group Discussion / Originality / Re: 1969 Z/28 motor mounts on: February 17, 2013, 02:45:09 PM
I didn't even mention items 5 through 10 (UPC Z28, sheet A4), which were added to the AIM on 6-2-69 (?). I believe these were a stop gap measure before the locking mounts were available. In fact, item #5 is called a "STOP"! It's a LEFT HAND item only, so it kind of adds to the above chart. Note the P/N 3886466 shows A.R. (As Required), and the P/N 3939728 shows only 1 being used.

For service requirements, I believe the 3886466 (non-locking mount) was attached to the right side of the engine and the 3939728 (locking mount) was attached to the left side of the engine!

For production, I have a feeling (no proof) that locking mounts were never used on the 302, but a stop gap measure was applied at some point during the production run. My copy of the AIM shows the date, but the month is kind of light and I can't be sure it's a 6 (June). Does anyone have a better copy that shows the month?
Ed

Ed,
you wrote:  "For service requirements, I believe the 3886466 (non-locking mount) was attached to the right side of the engine and the 3939728 (locking mount) was attached to the left side of the engine!"   
Did you mean in the subsequent year service manuals?  or ??   Why do you believe that?
.. also, from the latest photos posted of a supposed-original 3939728 mount, it doesn't appear to be 'locking'.   Was that a typo in your post?  or am I missing seeing something in those photos?
1603  Camaro Research Group Discussion / Originality / Re: 1969 Z/28 motor mounts on: February 17, 2013, 02:40:05 PM
In the last photos posted, the 'nut' appears to be 'welded' rather than molded in.   Wouldn't a molded in nut be on the opposite side where all the rubber is located?    What is the purpose of all the rubber on the side of the mount?  the holes (for the large bolts) in that mount appear to be round, rather than oblong.   Correct?
1604  Camaro Research Group Discussion / Originality / Re: 69 smallblock (302) Oil dip sticks on: February 16, 2013, 11:17:55 PM
(trying to bring the list up to date)...

Re: 69 smallblock (302) Oil dip sticks
--------------------------------------------------------------------------------
Each new poster should copy this and add his information to the list before posting.

type 1)   flattened handle on end, no PN, no plastic tip, stamped "ADD |           | FULL   USE GM 6041-M QUALITY MS OIL   E".  (E turned 90 deg).
type 2)    green tip on handle, no PN, no dimple,  stamped    "ADD !           ! FULL   USE GM 6041-M QUALITY MS OIL   M".

Member            Production           Dipstick
                     Plant       Week        Type
69Z28-RS        NOR        09C            flat
JOHNZ            NOR        02D            flat
BULLITT65      NOR        08C            flat
RSZMJT          NOR        06A            flat
jdv69z            NOR        10(68)        flat
68CamaroZ28  NOR        11(68)        Green tip
X77-69Z28      NOR        05A            flat
z28z11           NOR         01C            flat
Boston14        NOR         11D (68)     flat
Hans L                           04B            flat
LatebuildZ                     Nov68        green tip
LatebuildZ       NOR        10C           flat
firstgenaddict   NOR        10D (68)    flat
1605  Camaro Research Group Discussion / Originality / Re: 1969 Z/28 motor mounts on: February 16, 2013, 04:38:39 PM
Trying to read the part number:   Is it 3939728?  do you recall how they ascertained that was the production PN?  Is there factory documentation?
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