i have a 70 electra and understand that the 67 to 69 riv wp pulley is smaller. could someone confirm this annd then i would want this pulley if smaller,marty
If appears to me from looking at the parts books that the 68-1970 2 groove pulleys are the same diameter.
This is correct. My parts book shows the pulley for 67-70 400-430-455 to be 5.625" OD. This is the smallest diameter pulley listed for any of the 67-up big displacement Buick engines. 71-73 455 pulleys are 5.75" OD, and fit the long nose water pump. I have a 2-groove pulley from an unknown application that measures 5.25", but is deep one and would only work with a long nose water pump. If you are interested in trying it, let me know.
That change, to a long nose pump, will affect the fan blade's relationship to his fan shroud. Assuming the factory position is optimum, this could hurt low speed cooling.
me interesting topic short or long nose,im thinking mine is long but even after talking to TA i still cant tell. the subject came up because i want to buy their hi performance water pump for 455.Also pick up a smaller pulley. i thought that the two would be a good combo.......70 electra stock short or long...seems long? Going to measure my pulley,marty ---------- Post added at 03:46 PM ---------- Previous post was at 03:17 PM ---------- Jim i measured my pulley and for some reason i already appear to have a reasonably small one. My eyesight is not the best but it is slightly less than than 5 1/8. does it get any smaller and would it make a difference coming from 5 1/8 or slightly smaller,marty
As far as I know all 70 models came with the short nose water pump. I think the long nose was post 70.
There is no way for us to know which pump you have on your car. You will have to post a picture or take a measurement.
from where to where do you measure. is it from the back of the pulley to the end of the nose?? thanks
arty m i checked again and my water pump pulley is 5 1/8 accross . this is how i got the car. so i guess this is a smaller than stock pulley. I know some benefits of a smaller pulley but are there any probllems that could arise, marty
Marty The only major problems I can think of would relate to belt alignment, and perhaps finding belts of suitable length. I have heard others comment on the possibility of spinning the water pump too fast, and that this could cycle the water through the radiator before it can be cooled properly. I however have NO personal experience with this issue. I am of the opinion that Buick engineers burned a lot of midnight oil designing a sufficient cooling system. Unless a modified driveline has been installed in the car, there is little reason to deviate from a PROPERLY FUNCTIONING stock cooling system. Let me ask....are you experiencing overheating issues? Are there modifications to the car like increased compression, altered ignition timing, performance camshaft, etc?
compression is 9.5 to 1 . timing initially is 12 deg with totl 32 in by 2500 rpm. distributor was curved msd with box,290-94h cam stage 1 head job all work by scotty g. 18k mile on build,new hd clutch and 7 blade fan,water pump new at build,new belts. only really overheats with a/c on which was just fixed running r12. it will idle at 190 then with a/c on run at 200 n the highway at stop wiill go to 230 within 8 minutes and keep getting hotter. does not reall overheat past 210 with a/c off but still rises at idle a/c off but not nearly as quick. i am sold on the idea of TAs new 6 blade hi flow water pump and not really a great fan of push fans as they can restrict too. i am beginning to beleive my water pump is not working right and going to check it ,marty
I think spinning the pump too fast would cause cavitation, thereby reducing it's efficiency and possibly damaging the impeller blades of the pump.
your overheating problem is at low engine rpm and low to no foward motion (ie low airflow). I seriously doubt he's having a cavitation issue or coolant flowing too fast through the radiator under those conditions. Yes - you can spin a water pump too fast, what this is I dont know ... but I doubt Marty is seeing the north side of 5K very often or for any kind of extended periods. Correct me if I'm wrong
In my GS I have a 72 455 with A/C and the long nose pump and smaller dual groove pulley. When I first started it up the radiator water was flowing so fast that it shot at the side of the tank from the cores and splashed out the top. The engine was running hot. I had no thermostat in it. After installing the thermostat, the flow slowed down because the stat restricted it and my temps went down. So I would say that you can circulate the water too fast where it does not stay in the radiator long enough to cool properly.
Well heres the facts....i have a 180 thermosta 3rd one. car idles at 190 at first. we lasered everywhere when arriving at 190 stat opened . ardiator does run cooler on pass side and lower rad hose is no whre as hot as upper. measured tsta housing matched 190 on sunpro gauge. BUT it appears i do not have a 455 water pump pulley. it is 5 1/8 by 2 7/8. fan is 7 blade and is inside the 455 shroud by 1/4 incch with clutch missing radiator by 1,, 1/4 inch. this appears to be a 350 pulley how it fits i dont know yet all the data you guys have shown is that it should be 5.625. QUESTION is is this a problem in general,marty ---------- Post added at 11:27 AM ---------- Previous post was at 11:18 AM ---------- thanks jim but i think im going to look for the stock pulley as 5.625 as you sat. i beleive someone somehow put a 350 ppulley in my car mesuring 5 1/8. i think it makes sense to take that step first...also i elaborate more in another post a few minuuttes ago,marty
Do you show a water pump pulley diameter for a 70 electra with ac...i heard the a/c cars may have had smaller pulleys. Also do you see part no 1264070 a water pump pulley thats about 5 7/8,two groove buick,thanks marty
