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Old 07-21-2021, 11:10 PM
'ol Pinion head 'ol Pinion head is offline
Ultimate Warrior
 
Join Date: Apr 2000
Location: INJUN Territory, Red State Merica!
Posts: 9,567
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'69 Pontiac V8's used the short (4" hub height) 11 bolt waterpump, casting 9796351.
The last dates cast in Pontiac's Central Foundary of the "351" water pumps were in late June of '69. I've pulled over a half a dozen June of '69 dated "351" casting wp's to rebuild over the last 29 years along with multiple dozen which were dated earlier in the '69 calendar year. F049 & F239 were two of the dates, I've had that were cast very late.

'70 model Pontiac V8's went to the first 4.5" hub height 11 bolt water pump. These were the 9799124 casting water pump. The first dated "124"s I've had were dated in July of '69 (Gxx9).
Between original "351" & "124" casting water pumps, I've easily pulled 7-8 dozen since '92, when I first had original Pontiac water pumps rebuilt. Have also picked up quite a few loose at swappers & from fellow Pontiacer's garage clean outs.

Have numerous original dated Pontiac Master Parts Catalogues. Earliest is dated in '71. I do not have a late '69 or 3/70 dated MPC. Some time in that time range, it became an official Pontiac Service procedure to replace the original short "351" 1969 water pump along with its corresponding "059-062" '69 model water pump pulley with a tall "124" casting wp. In doing so it also required changing to the correct '70 Pontiac V8 A, B, G series wp pulley; a "127 through "130".

At the bottom of Group 1.062 in my 3/72 dated Pontiac MPC (its handy) there is the following note;
(*4) "Must be used with water pump with casting ending w/9124, when replacing original water pump with casting No 9796351.

The above note was carried forward in quarterly dated Pontiac MPC for pre '74 models up till the last printed bound version of the models through '74 Pontiac MPC, dated April 1983. Im sure it was first noted in Pontiac Technical Service Bulletins in the very late '69 or early 70 time frame.

More for thought.
-First production '70 model A, B, G series Pontiacs were assembled in late August of 1969.
-The '69 style Firebird continued to be built up into at least Nov of 1969.
-Have rebuilt several original June of '69 dated "351" water pumps for owners of late '69 production T/A's & Firebird 400's.
-Pontiac A,B, & G series v8 engines definitely went to "124" casting "tall" 11 bolt water pump & "70 model Pontiac A, B, G series pulleys at the beginning of '70 model production.

'69 V8 Firebirds... Here's what several of us have seen. When equipped w the factory 5 blade flex fan & it's Firebird specific small round style fan spacer, swapping to a later 1/2" taller 11 bolt pump, put the 5 blade flex fan that much closer to the 4 core radiator. It did the same with the clutch fan on a factory AC car, but the 5 blade flex fan had more "move" to its blades. MY TAKE... there is an optimum spacing with the shallow early Firebird fan shroud & the factory 5 blade flex fan. Pontiac seems to have stayed with the "351" casting wp for these late '69 season V8 Firebirds, that also jives with what I've noted many years ago first pulling original dated wp's, pulleys, & timing covers from late season '69 V8 Birds.

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