When I take it all apart for the timing gear/chain HB replacement I'll measure and take them to a local joint and research the pulley I have... which is another thing adding to the confusion. Knowing there was a difference in water pumps (thanks PontiacJim) one guy said to just switch to the 4.5". I told him no because it's not that simple (because I had read about all the different pulley applications (stock, long, short, smaller/larger for higher or lower flow etc etc) so I wanted to stay with the 4" pump.
Since it is currently working I'm on the lookout for a place to rebuild mine in the winter and next month the Pontiac National event here will have lots and lots of used parts vendors at the swap meet.
Thanks again guys, I appreciate it very much!
Dan, the reason Ames was asking for a date built for your car doesn't have anything to do with any change in wp pulley, Ames is selling Quanta's embossed date coded belts, have been buying Quanta's belts for years.
The early vs late "69" waterpump issue.
For ''69 models, Pontiac A-B-F-G series with Pontiac V8's ALL originally used the "351" casting 11 bolt waterpump with the short hub. Once the '70 models started rolling out, in late August of '69, the first tall waterpumps, the "124" castings, were used. The "124"s were used on all '70 V8 Pontiacs. The confusion with the terminology, ie; "early" and "late"' '69 waterpumps stems from one thing, and that is the '69 Firebirds continued to be produced for several months, up into late Nov of '69, and as V8 builds were produced with the "351" short hub casting pump.
Have extensively studied this and come to the conclusion, the reason the '69 V8 Bird continued with the short hub pump is directly tied to tight clearance issues with the 5 blade flex fan and matching alum fan spacer. Attempting to substitute the taller "124" pump, the fan is jambed very close to the V8 Firebirds radiator. This wasn't an issue in any other body style Pontiac in '69-72, as the fans shrouds were very deep. To further confuse issues, Pontiac began offering the tall 11 bolt waterpumps to replace the original "351" pumps, but this required buying the correct waterpump pulley through the parts dept Ck any original '71 and later dated master parts books and there were notations to use such and such pulley when substituting the taller waterpump.
Original Pontiac pulleys, brackets, complete Ps changeovers, have 3/4 of a pallet rack section dedicated to just pulleys and brackets. have been putting together and supplying 11 bolt waterpump pullley changeovers for the last 23 years. Ship out several clean original pulleys each month.
Needing an original waterpump rebuilt, I usually do 4 to 6 runs per year and am very price competitive and only use the best bearing inserts and seals in the rebuild process. Have a decent stock of clean original early Pontiac v8 WP cores along with usuall a dozen or two dated correct castings for '68 to 72 models. Do quite a few outright sales of rebuilt pumps. Only set back I occasionally run into is keeping correct cast impellers in stock. There are five different style cast impellers used for all the different '63-81 Pontiac V8 waterpumps, and if a restorer has a certain pump and it has a stamped steel impeller in it, occasionally, I don't have a core I can rob the correct style cast impeller out of. In that case, will let the restorer know, when I get the correct impeller in, and then they can ship in their pump, so there is no lag time of me setting on their pump. Tentatively, have 7 original pumps on the rebuild list for next month, feel free and PM for any needs.