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#1
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water pump
I am seeking a advice on a replacement water pump for my 78 WS6.
THANX! |
#2
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Ames performance has a nice one with the right/ good cast impeller.
You could also send yours out and get it rebuilt if your ok with laying the car up for a month.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 11-29-2017 at 02:42 PM. |
#3
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If its not the original casting & date range, have several late '77 casting pumps in stock. Have one late '77 pump fresh rebuilt, as always with the correct cast impeller. Its slated for a '79 PWH engine build, but that may not happen til April. Also have another rebuild session going after the first of the year.
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Buzzards gotta eat... same as worms. |
#4
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Unless you want original iron, you can buy an alum Flowkooler or PRW.
https://www.summitracing.com/parts/bra-1649/overview/ https://www.ebay.com/itm/PRW-1445500...-/380526071479 Edelbrock has a really high dollar model, and GMB has a cheap one. https://www.summitracing.com/parts/edl-8856/overview/ https://www.summitracing.com/parts/g...80al/overview/ Last edited by ponyakr; 11-29-2017 at 04:35 PM. |
#5
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I just bought a "Gates" pump for my 68, very nice piece, cast impeller too. From Rock Auto.
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#6
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Quote:
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#7
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Get OPH to rebuild the original, better than any aftermarket pump.
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#8
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Are you looking for #'s correct pump, or a pump that will do the job well?
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#9
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I had a GMB on my car, bearing pooped after 2000 miles, not something I'll use again.
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#10
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Well, I just received a GMB aluminum pump, I hope it lasts..... might take a while before I get 2000 miles on my car to evaluate the quality of this product.
Anyone else have a good or bad experience with GMB pumps? |
#11
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I thought the first review of the Milodon pump, on the Summit site, was very interesting. The guy says the Milodon is just a reboxed GMB.
https://www.summitracing.com/parts/m...w/make/pontiac https://www.summitracing.com/parts/g...RoCO80QAvD_BwE Last edited by ponyakr; 11-30-2017 at 11:25 AM. |
#12
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I await getting home today to see what style impeller it has.
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#13
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I see where GMB has multiple pumps available, which one did you try?
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#14
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Quote:
I worked at an auto parts store from 1985-1998. Somewhere in that time we had a line of strictly "new" import water pumps. I ordered a Pontiac, was surprised it was aluminum. Thinking I'd found an affordable aluminum water pump. So much for a bargain... The life span on Mine went for several years, because, I seldom drove the car, as you intrend to with yours... I sold another one of those exact pumps to a friend with a 70 GTO. His car saw more driving time. Seemed like about a years time on his before it crapped out. I was in a hurry when the aluminum pump gave out. I bought a "New" AC Delco pump. It was an iron pump with the stamped impeller. I adjusted the seperater plate for absolute minimum clearance. This pump was the 4th one I had installed. TIt was the 4th because, when I performed other engine repairs/modifications in that area, I replaced the pump, preventatively. The iron pump with the modified plate cooled the engine exactly as cool as the O.E. pump. Man, wish I'd kept the O. E. pump. The other pumps had no cooling issues, just ran slightly warmer...
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#15
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One thing learned many years ago is many of the '77-81 Pontiac v8 water pumps originally used a "296" pump with a cast impeller with abbreviated fins. The slightly shorter fins worked fine in even in my modded Turbo 301, this design impeller also has slightly less drag. That particular style impeller also works well in a street/strip type engine that the block has had its coolant capacity reduced by a short fill of hard block.
On a normal 400-455 11bolt pump cooling deal, like a W72 400, am not rebuilding with that impeller, but using the correct full length cast impeller. Pontiac used at least 5 different cast impellers in original V8 waterpumps from '63-81. they designed the original pumps to match cooling system's needs, and as time progressed, introduced cooling system refinements. As Tom V likes to note "Engineers do things for a reason"! For many cooling applucations, its very hard to beat a correct design cast impeller waterpump. The majority of original Pontiac cores I have are '64-73 range, some of the early casting numbers are getting very very hard to come up with. With the interest in '77-79 400 models, have dug out more of that date range pump cores & am rebuilding upon need.
__________________
Buzzards gotta eat... same as worms. |
#16
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Getting an OEM waterpump rebuilt is a good idea. The factory waterpumps and their nice cast impellers are good quality. I was in a pinch when I replaced my waterpump - so, I used the Napa TruFlow waterpump #41302. I think this is the same as the Gates #43102. This is a new pump (not too pricey) and I thought it has decent cast impellers that are a little shorter than factory. If using a non OEM pump (maybe OEM too?) I think it is a good idea to check your clearance between the divider plate and your impeller. I adjusted my divider plate slightly to get better clearance - this thread has details http://forums.maxperformanceinc.com/...d.php?t=411256
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#17
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I figured I would add my latest experience to this older post for those looking for info on water pumps. I just bought a NAPA TFW 43102 pump. The pic online shows a cast impeller but the pump I got yesterday (12/28/2021) has a stamped steel one. A test fit with my new Ames ss divider plate shows about a 1/4" of clearance. (The new divider plate fits nice against my old pump with the cast impeller.)
Too bad, this was one of the pumps that was a good option. |
#18
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I chucked a duralast one from autozone on pontiac 350 a week ago. It was new, lifetime warranty, and $42. I ordered it in am, it was there 2 hrs later. Came with gaskets, no divider. I had a new one on the shelf. It has a cast impeller, and seemed minty. Time will tell. If it dies, i go grab another on the house
__________________
1970 Formula 400 4 speed 2006 Gto. Ls2/m6 1972 Gto 455ho/th400 post coupe 1973 Grand Am 400 4 speed |
#19
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I got a Dayco DP836 from RockAuto. It has a cast impeller (like the image on the website) and has the same clearance with my new divider plate as my old pump and divider which I had in the car for the last 25years.
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#20
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im a little late to this thread, but as mentioned if original isnt a concern i use & like the PRW aluminum pump. it has a cast impeller but the vanes have been machined to a cleaner shape, not sure what the benefit of that is but they felt it was worth it to do as opposed to just leaving them rough cast. it also was very close to the divider plate & only required minimal effort to get a tighter clearance. i run a 467 E-head stroker with only a budget 3 row alum radiator & the car runs at 180-190 in all situations from hot summer street driving to drag racing.
anyone have opinions on the machined vanes? https://butlerperformance.com/i-3164...w-1445500.html |
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