'68 427 diverter valve (A.I.R.)

[George W.]

28296 is accepted as the correct diverter valve on '68 427 AIR systems.
I have a very late '68 engine that is/was very original and complete--(starting parting out after efforts to find car/owner failed).
AIR pump is coder 184th day of 1968, first shift, Y plant.
The diverter is coded 24763.
Every other part/piece on this AIR system has correct dates/stampings/bolts/clamps/etc.
Wondering about this 24763, was there a change late in the '68 production year?
Is it a service replacement piece?
Thanks,
George

[Joe L.]

Re: '68 427 diverter valve (A.I.R.)

28296 is accepted as the correct diverter valve on '68 427 AIR systems.
I have a very late '68 engine that is/was very original and complete--(starting parting out after efforts to find car/owner failed).
AIR pump is coder 184th day of 1968, first shift, Y plant.
The diverter is coded 24763.
Every other part/piece on this AIR system has correct dates/stampings/bolts/clamps/etc.
Wondering about this 24763, was there a change late in the '68 production year?
Is it a service replacement piece?
Thanks,
George

George-----


I can't find any record of a diverter valve with identification number 24763 (which would be a derivative of a full part number of 7024763).

Are you finding this number STAMPED into the main body of the valve near the flange which connects it to the AIR pump?

[George W.]

Re: '68 427 diverter valve (A.I.R.)

[Joe L.]

Re: '68 427 diverter valve (A.I.R.)

George------


I can barely make out the stamping on the valve but it does look like it is 24763. As I mentioned, that would represent a valve of GM #7024763 and I can't find any information on such a valve. However, the valve is configured as I would expect for a correct 1968 big block. This configuration is somewhat unusual and I don't know of any other non-Corvette valves that are configured exactly like it. Some 1969+ big block diverter valves are similarly configured but differ internally.

The 1968 valves were also unique in 2 other ways. Most 1968 valves used a muffler that was not an integral part of the valve but was a separate piece attached with a clip. For 1969+ valves, the muffler was an integral part of the valve and was "crimped" to the valve. 1968 valves also incorporated no relief valve. A separate relief valve was integral with the pump. For 1969+ valves, the relief valve function was incorporated into the diverter valve and the relief valve was deleted from the pump.

By the way, the 1968 big block valve and pump was also used for 1969 L-88 and ZL-1 but not for any other 1969 or later application.

[George W.]

Re: '68 427 diverter valve (A.I.R.)

Sorry the photo was not better.

Every other aspect of this A.I.R. system is correct--deep groove pulley, correct stamped hoses, dated clamps, etc.,etc..

Are you saying that the '69 L-88 and ZL-1 used this set up, but with the 29296 valve?

Seems very odd that there is no information on this 24763 valve.

Oh well, thanks the input.

George

[Joe L.]

Re: '68 427 diverter valve (A.I.R.)

Sorry the photo was not better.

Every other aspect of this A.I.R. system is correct--deep groove pulley, correct stamped hoses, dated clamps, etc.,etc..

Are you saying that the '69 L-88 and ZL-1 used this set up, but with the 29296 valve?

Seems very odd that there is no information on this 24763 valve.

Oh well, thanks the input.

George

George------

1969 L-88 and ZL-1 used the exact same AIR system as all 1968 big blocks, including the 7028296 diverter valve.

If one looks at AIM sheet A4 of the 1968 UPC L-36 (which includes the AIR set-up used for all 1968 Corvette big blocks) one will note that the revision block begins with "8". This means that there was another sheet that included revisions #1 through 7 but that sheet was removed from the copy of the AIM from which the copies we have today were made. One will also note that the font for item number 14, the 7028296 diverter valve, is different than the font used for the other items. Together, these two observations strongly imply that there was a predecessor part number for the valve. Very possibly that number was 7024763. However, if so, I can find no information that such a valve was ever available in SERVICE but it's still possible it was used in PRODUCTION for some period of time.

[Terry M.]

Re: '68 427 diverter valve (A.I.R.)

George------

1969 L-88 and ZL-1 used the exact same AIR system as all 1968 big blocks, including the 7028296 diverter valve.

If one looks at AIM sheet A4 of the 1968 UPC L-36 (which includes the AIR set-up used for all 1968 Corvette big blocks) one will note that the revision block begins with "8". This means that there was another sheet that included revisions #1 through 7 but that sheet was removed from the copy of the AIM from which the copies we have today were made. One will also note that the font for item number 14, the 7028296 diverter valve, is different than the font used for the other items. Together, these two observations strongly imply that there was a predecessor part number for the valve. Very possibly that number was 7024763. However, if so, I can find no information that such a valve was ever available in SERVICE but it's still possible it was used in PRODUCTION for some period of time.

George & Joe,
1968 AIM UPC L36, Sheet A4: Items 1 through 7 do not detail any change for the diverter valve. It is shown as part number 7028296 on this sheet, and no change numbers are shown on that line. I can scan that sheet on Monday from work (time permitting) if you wish, but there is nothing to see here -- move on.