1965 327/365 Replacement Water Pump

[Joe C.]

I'm looking for suggestions on this for a car that is raced occasionally, and generally seeing shift points of 7500 RPM give or take 250 RPM. This car is a driver and highway cruiser for most of its life. I have run out of options with the "incorrect" pump without the bypass hose, as well as the correct 326 pump with the bypass hose. AFAIAC they are both junk.

I am not concerned about correctness. I simply want a pump that will stand up to the occasional abuse that I subject it to, and will reside in the same place as a stock pump.

A bypass hose would be "nice" as far as "looks" are concerned, but not functionally necessary.

Thank you in advance,
Joe Ciaravino

[Joe L.]

Re: 1965 327/365 Replacement Water Pump

I'm looking for suggestions on this for a car that is raced occasionally, and generally seeing shift points of 7500 RPM give or take 250 RPM. This car is a driver and highway cruiser for most of its life. I have run out of options with the "incorrect" pump without the bypass hose, as well as the correct 326 pump with the bypass hose. AFAIAC they are both junk.

I am not concerned about correctness. I simply want a pump that will stand up to the occasional abuse that I subject it to, and will reside in the same place as a stock pump.

A bypass hose would be "nice" as far as "looks" are concerned, but not functionally necessary.

Thank you in advance,
Joe Ciaravino

Joe------


The problem you are having with the pumps you mentioned is that they are "small" bearing pumps. All 1955-70 small block pump are "small" bearing type.

There are several options for you using pumps with the large bearing and shaft. My recommendation for you would be to use an aftermarket aluminum pump which all include the large bearing and shaft. You need one that has a 5/8" pilot shaft, the 55-70 hub spacing, and a hub with dual bolt patterns. I used a Weiand pump of this type for years. Immortal.

[Joe C.]

Re: 1965 327/365 Replacement Water Pump

Joe------


The problem you are having with the pumps you mentioned is that they are "small" bearing pumps. All 1955-70 small block pump are "small" bearing type.

There are several options for you using pumps with the large bearing and shaft. My recommendation for you would be to use an aftermarket aluminum pump which all include the large bearing and shaft. You need one that has a 5/8" pilot shaft, the 55-70 hub spacing, and a hub with dual bolt patterns. I used a Weiand pump of this type for years. Immortal.

Thanks Joe. I'll look in that direction.

[Joe C.]

Re: 1965 327/365 Replacement Water Pump

If you look at:

http://www.stewartcomponents.com/index.php?route=product/category&path=60_66

which of these would you be inclined to use.

[Joe L.]

Re: 1965 327/365 Replacement Water Pump

If you look at:

http://www.stewartcomponents.com/index.php?route=product/category&path=60_66

which of these would you be inclined to use.

Joe-----


A lot depends upon something that's not clear in the Stewart information and specs. Specifically, when Stewart specifies a shaft size, is that the size of the PILOT shaft or is it the size of the shaft THROUGH THE BEARING? Based upon how I interpret it, I think they're talking about PILOT shaft size. If you are going to use stock pulleys and stock fan clutch, then you need a pump with a 5/8" PILOT shaft and 1-3/4" bolt circle. Since all of their pumps use a dual pattern hub, that becomes a non-factor in pump selection.

Assuming that by "shaft size" they mean PILOT shaft size, then I'd go with either of the following:

aluminum pump----#22103

cast iron pump------#12103

[Chris D.]

Re: 1965 327/365 Replacement Water Pump

Joe-----


A lot depends upon something that's not clear in the Stewart information and specs. Specifically, when Stewart specifies a shaft size, is that the size of the PILOT shaft or is it the size of the shaft THROUGH THE BEARING? Based upon how I interpret it, I think they're talking about PILOT shaft size. If you are going to use stock pulleys and stock fan clutch, then you need a pump with a 5/8" PILOT shaft and 1-3/4" bolt circle. Since all of their pumps use a dual pattern hub, that becomes a non-factor in pump selection.

Assuming that by "shaft size" they mean PILOT shaft size, then I'd go with either of the following:

aluminum pump----#22103

cast iron pump------#12103

Joe,
Stewart's downloaded catalog does show these to be 5/8" pilot with 3/4" bearing shaft. These are nice units and one has served me well for several decades. Nobody will mistake these for stock however as the casting is wildly different.

Catalog chart also lists overall length. In years past Stewart differentiated between the pass car (5-9/16") and Corvette HP (5-11/16") hub location. Seems they now have taken the typical rebuilder's approach to split the difference at 5-5/8" and sell the same pump to both applications. Some hub adjustment may be in order if the OP goes that way.

[Joe C.]

Re: 1965 327/365 Replacement Water Pump

I am hearing from some people that running a stock fan/clutch combo won't stand up to occasional 8000 RPM operation.