new to the forum, just wondering if anyone knows of a short nose waterpump for a 1972 olds 350.

also wanting to know how much boost i can run with stock pistons, #7 heads


thanks Quinton

 

There are three different length Olds water pumps. Naturally, pulleys and brackets need to match the pump.

P1010070-1.jpg



Note that the drawing above is from the 1971 Chassis Service Manual. Other years used these pumps in different applications.

As for boost, the question is WHICH stock pistons? Olds varied compression ratio by changing the size of the dish in the piston.

 

all i know is that it is a 395558 block with a/c

 

That block was used on all 350s from 1968 to 1976. The year of manufacture can be deciphered from the stamping on the VIN pad near the #1 cylinder. Also, the heads can be identified by the casting number below and to the left of the #1 spark plug hole.

 

If yours is out of the car, measure the distance as the pictures show.

My car has no ac and the short 5.072 pump. It was a pain in the as* to find the one that matched up, but eventually I did.

I'm guessing you're is probably one of the longer ones. But if it turns out to be the shorter, I'll post the part number for mine later, I'm away from the house for the night. I've had it on my car for 4 years, and probably 12000 miles, no problems yet.

 

I believe i have the long pump.
The pump is still in the car and i can have a few pics in the morning.

 

I've had this one on the shelf for a few years. It is just a touch under 6".
$45 plus the ride if wanted. The #'s read from the top 412265 under those: D19Y
Under those:257.

 

Check with your local auto parts store. NAPA shows a reman water pump for a '72 350 for ~$30:

http://www.napaonline.com/Catalog/Ca...297_0267421098

 

I went to the NAPA link above
It does not appear to say completely what the year/ model/ engine/ AC-ness fitment is

They also do not appear to understand how a WP works:

"Important Information:
w/ Air Conditioning
w/ Standard Pump
w/ 1 Outlet"

Uhm, right, all Olds WP's of this type have two OUTlets, L & R sides between the larger diameter 5/16 bolts. There may be 2 or 3 IN-lets: the mandatory one from the radiator, the usual one from the thermostat bypass, and the optional one from the heater core.

Accuracy in reporting.

 

"I believe i have the long pump. "
=======================
huh, so, it's either the long, or the short. Or maybe the medium?
:-)

What if you were to measure the existing one and/or relate the ID of the pulleys you want to use, so that the correct pump can be procured? I imagine RockAuto can get you the right pump cheap. You may have to fabricate what year/ model/ engine/ etc. you "need one for" in order to get one that matches your pulley set.

 

Pizza,

We can't do anything but guess until you measure the pump length.

I'm sorry, old cars are a PITA, but we don't want to guess and have you spend money on parts that won't fit.

You can reach in without taking anything apart(esp. if you don't have a fan shroud), and let us know the length. Or take a small pole, like a dowell, and mark it, then measure that if a small pocket sized tape measure isn't at hand.

 

If you take it to your local auto parts store , they can send it out to get rebuilt , thats what I did . Then you know you have the right one.

 

sorry for the vague responses, here is a little background on the motor. i will be putting this into a 1995 range rover classic with a th475 auto trans.

i have done this conversion before and am wanting to do it again with a little more refinement.

i only have about 1 inch of clearance between the radiator and fan pulley.

my questions are if i can run an electric pump or if anyone knows of a very short water pump.

as for boost i have a CAT D4 turbo i am wanting to run on it. so i need to know how much boost i can put on stock pistons or if i have to put forged ones in.



thanks for all of the input

 

I don't see why you couldn't use a race type electric pump.
Or, get a 5.1" OEM pump, and use the correct pulleys to suit it.
If you decide to try that, I can tell you what pulleys to use. Do you have power steering to worry about, or AC? AC might rule out the 5.1" pump.

 

a/c= roll the window down

i do have a power steering pump but the fittings are the same from thew land rover box to the sagina pump so no worries on that.

 

Interesting. Is this RWD or 4WD?

In any case, the 5.1" pump is the shortest one made for an Olds motor, as shown in the photo and diagram I posted above.