Part # Q for Jorjorian/Joe Lucia

[Michael H.]

I have a part number question for Bob Jorjorian and/or Joe Lucia, the only other two that I know of, besides myself, that can somewhat accurately pinpoint a time in production when a part number/part would have been released for that year production just by the numerical value of the number.
For example, a part number in the numerical range of 3878xxx would most likely have been something for SOP of the 66 model year. A number in the 3740xxx range would probably have been a part for a 57, and so on.

The question is, what model year would most likely have used a part number/part in the 3852000 range?

[Joe L.]

Re: Part # Q for Jorjorian/Joe Lucia

I have a part number question for Bob Jorjorian and/or Joe Lucia, the only other two that I know of, besides myself, that can somewhat accurately pinpoint a time in production when a part number/part would have been released for that year production just by the numerical value of the number.
For example, a part number in the numerical range of 3878xxx would most likely have been something for SOP of the 66 model year. A number in the 3740xxx range would probably have been a part for a 57, and so on.

The question is, what model year would most likely have used a part number/part in the 3852000 range?

Michael------


1964 and, possibly, a part released sometime shortly after the start of 1964 production.

[Michael H.]

Re: Part # Q for Jorjorian/Joe Lucia

Michael------


1964 and, possibly, a part released sometime shortly after the start of 1964 production.

Thanks Joe. I agree. So, in your opinion, it's highly unlikely, or not possible at all, that we would find a part in this number range originally installed on a 62 or 63?

Here's the point. The numbers below are the part numbers found in the respective assembly manuals for the valve cover horsepower decals used for 62 through 65.

3816289...... 62-65 300 Horsepower

3816290...... 62-63 340 Horsepower

3816291..... 62-63 360 Horsepower

3850520..... 64-65 365 Horsepower

3853877..... 64-65 375 Horsepower

We see that decals released for the new 64 model year are in the 3850xxx part number range while those released for 62 are in the 3816xxx range, correct numerically for introduction of 62. Makes perfect sense and the numerical value of the numbers fit nicely for the respective model years.

Here's the issue. The part number for a 250 horsepower decal is 3852257. That pretty much proves that it couldn't have been included in the list of parts used for any 62 or 63.

More proof is the fact that the 250 HP decal, or it's part number, are not shown anywhere in the 63 assembly manual. The others are.
A 250 horsepower decal didn't exist in 1962 and was first produced for the 64 model year in mid 1963.

This gets deeper. More info later.

Thought ??

[Joe L.]

Re: Part # Q for Jorjorian/Joe Lucia

Thanks Joe. I agree. So, in your opinion, it's highly unlikely, or not possible at all, that we would find a part in this number range originally installed on a 62 or 63?

Here's the point. The numbers below are the part numbers found in the respective assembly manuals for the valve cover horsepower decals used for 62 through 65.

3816289...... 62-65 300 Horsepower

3816290...... 62-63 340 Horsepower

3816291..... 62-63 360 Horsepower

3850520..... 64-65 365 Horsepower

3853877..... 64-65 375 Horsepower

We see that decals released for the new 64 model year are in the 3850xxx part number range while those released for 62 are in the 3816xxx range, correct numerically for introduction of 62. Makes perfect sense and the numerical value of the numbers fit nicely for the respective model years.

Here's the issue. The part number for a 250 horsepower decal is 3852257. That pretty much proves that it couldn't have been included in the list of parts used for any 62 or 63.

More proof is the fact that the 250 HP decal, or it's part number, are not shown anywhere in the 63 assembly manual. The others are.
A 250 horsepower decal didn't exist in 1962 and was first produced for the 64 model year in mid 1963.

This gets deeper. More info later.

Thought ??

Michael-------


I would say that it's virtually impossible that any part with a part number of 385xxxx was around for the 1962 or 1963 model years. I would not absolutely rule it out for very late in the 1963 model year but I really HIGHLY doubt it.

There are a few areas for which the "general rule of correlation between part number and release date" does not work. These are:

1) engine parts, including castings, from the 1953-56 period for both I-6 and 265 V-8. Many of these are in the 383xxxx part number range;

2) some other castings. For some reason, castings sometimes have part numbers and release dates which don't follow the "general rule". When this occurs, it's usually a case of the casting being released earlier than the part number would otherwise indicate. For the most part, though, castings do follow the "general rule".

The valve cover decals obviously don't fall into either of the above categories, so I would say they would almost certainly follow the "general rule".

[Bob J.]

Re: Part # Q for Jorjorian/Joe Lucia

Michael------


1964 and, possibly, a part released sometime shortly after the start of 1964 production.

I agree, generally accepted 3848XXX begins 64 part number range.
Bob

[John T.]

Re: Part # Q for Jorjorian/Joe Lucia

I am confused. There was a 250 decal in 1962. The part number was 3816235 which is in the ranges discussed above.

John

[Michael H.]

Re: Part # Q for Jorjorian/Joe Lucia

I am confused. There was a 250 decal in 1962. The part number was 3816235 which is in the ranges discussed above.

John

John,

The 3816235 that you mention is the "327 Turbofire" sticker that was in the center of the valve cover for 62 and early 63. (changed to 3832180 during the 63 model run to the end of 66 production)

The horsepower decal for optional engines would have been below/outboard of the "327" sticker.

[Wayne M.]

Re: Part # Q for Jorjorian/Joe Lucia

I agree, generally accepted 3848XXX begins 64 part number range.
Bob

Bob and Joe -- looking in the parts history section of the Chev P&A30 parts catalogs (Chev Passenger, Corvette, light trucks), the October 1962 version shows a part # 3847691 as being "removed" in 10-60.

Also, a year later in the Oct '63 catalog, there's about seven #'s 3847xxx with early '61 to late '62 dates (with instructions to remove, or use a different part, or [inventory] mix).

[Joe L.]

Re: Part # Q for Jorjorian/Joe Lucia

Bob and Joe -- looking in the parts history section of the Chev P&A30 parts catalogs (Chev Passenger, Corvette, light trucks), the October 1962 version shows a part # 3847691 as being "removed" in 10-60.

Also, a year later in the Oct '63 catalog, there's about seven #'s 3847xxx with early '61 to late '62 dates (with instructions to remove, or use a different part, or [inventory] mix).

Wayne------


GM #3847691 was an engine mounting unit for 1947-53 trucks and was the ORIGINAL part number from at least 1953, not a replacement.

I checked and, apparently, the situation I described in (1) in my previous post involved more than just 383xxxx part numbers. It extended all the way to 3847xxx. However, it was not a complete series that involved all numbers between these numbers. So, some series of part numbers between ABOUT 383xxxx to ABOUT 3847xxx were released way back in the late 40's to mid 50's. It's also very possible that some unused part numbers in that series were issued later but that would take a lot more tedious research than such an effort is worth to me.

[Joe L.]

Re: Part # Q for Jorjorian/Joe Lucia

All------


I've "narrowed down" the out-of-sequence 38xxxxx part number ranges issued in the late 40's to mid 50's to ABOUT the following:

3800000 to 3812550

3835000 to 3837300

3845000 to 3845250

3847000 to 3847700

I want to make it clear that I don't guarantee the above to be 100% accurate, especially at either end of each range. Also, as I mentioned previously, it is very possible that particular part numbers or groups of part numbers in these ranges were "skipped" and issued later, possibly but not necessarily in the 1962-64 period.

I really do not think that the "general rule for relationship between drawing/release date and part number" had any meaning or import whatsoever within GM. To a releasing division, all that was important was that they had an unassigned part number assigned to their division to assign to a particular part.

The "general rule for relationship between drawing/release date and part number" is something that we have observed as an "historical artifact" and MAY be useful in figuring out when a part might have its origins. It is anything but an "exact science", however.

So, why did the above-referenced WAY out-of-sequence part numbers get released when they did? I have absolutely no idea. But, I'll bet if we knew, there would be quite an interesting story behind it.

[Michael H.]

Re: Part # Q for Jorjorian/Joe Lucia

Wayne------


GM #3847691 was an engine mounting unit for 1947-53 trucks and was the ORIGINAL part number from at least 1953, not a replacement.

I checked and, apparently, the situation I described in (1) in my previous post involved more than just 383xxxx part numbers. It extended all the way to 3847xxx. However, it was not a complete series that involved all numbers between these numbers. So, some series of part numbers between ABOUT 383xxxx to ABOUT 3847xxx were released way back in the late 40's to mid 50's. It's also very possible that some unused part numbers in that series were issued later but that would take a lot more tedious research than such an effort is worth to me.

Thanks Joe. So, other than a few areas of odd numbers from the 40's and 50's, the system we use still works. Our 3816289-90-91 (300, 340 and 360 HP decals) are around start of production for 62, and the 3852257, the 250 HP decal, is definitely around start of production for 64. (we know that no such decal was used in the 40's or 50's)

It's safe to assume that the 250 HP decal did not exist in 1962 or much of 1963, and could not have been used in production for the 62 or 63 model year.

[Joe L.]

Re: Part # Q for Jorjorian/Joe Lucia

Thanks Joe. So, other than a few areas of odd numbers from the 40's and 50's, the system we use still works. Our 3816289-90-91 (300, 340 and 360 HP decals) are around start of production for 62, and the 3852257, the 250 HP decal, is definitely around start of production for 64. (we know that no such decal was used in the 40's or 50's)

It's safe to assume that the 250 HP decal did not exist in 1962 or much of 1963, and could not have been used in production for the 62 or 63 model year.

Michael------


Yes, I would say it's VERY safe to assume that the 250 hp decal did not exist during the 1962-63 model years except, POSSIBLY, at the very end of the 1963 model year. The only way I can see that such a decal could have existed for 62-63 is if there was a predecessor part number. I have no information which would indicate that, though.

[William N.]

Re: Part # Q for Jorjorian/Joe Lucia

P/N 3852257 was released on 6-20-1963, however there was a P/N 3816235 called out for the base motor (250 hp) in the 1962 assembly manual. Interestngly the 62 assy manual doesn't show the installation of the central 327 label, but the 1963 assembly manual does. That would lead one to believe that Flint installed the central one and St. Louis the HP one in 62, and the roles were reversed in 1963?

[Joe L.]

Re: Part # Q for Jorjorian/Joe Lucia

P/N 3852257 was released on 6-20-1963, however there was a P/N 3816235 called out for the base motor (250 hp) in the 1962 assembly manual. Interestngly the 62 assy manual doesn't show the installation of the central 327 label, but the 1963 assembly manual does. That would lead one to believe that Flint installed the central one and St. Louis the HP one in 62, and the roles were reversed in 1963?

William-----

Is that 6-20-63 date an actual RELEASE date for the part or is it the date of the DRAWING?

[Ronald L.]

Re: Part # Q for Jorjorian/Joe Lucia

Joe, any idea what part followed this 54 part in your series above?
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