67 Z/28 WATER PUMP

[Ron C.]

I know we have talked about this before with different opinions, I have a waterpump with a number on the front 3858326, is this the correct pump for a 03b z/28? I want to make sure before I send it out to get rebuilt.thanks Ron.

[1968RSZ28]

Ron -

The 3858326 casting number is correct for the '67 and '68 Z/28 per Jerry MacNeish's book.  Just make sure the date code on it is correct for your 03B car.  Other casting numbers were also used.  For example, my '68Z's water pump has casting number 3859326 on it.  Good luck.  

Paul

[Ron C.]

Thanks Paul. 

[Jerry@CHP]

There are variations on the NPT hole in the water pump and both are acceptable.  Some factory cars had a 3/4" NPT reducer to adapt the 1/2" NPT bypass fitting.  More on this in the new 4th edition Z28 book out soon,

Jerry

[JohnKY]

There are variations on the NPT hole in the water pump and both are acceptable.  Some factory cars had a 3/4" NPT reducer to adapt the 1/2" NPT bypass fitting.  More on this in the new 4th edition Z28 book out soon,

Jerry

Sorry to resurrect an old old thread. Was the reducing bushing in the top of the water pump the hex head type, or a face bushing? Face bushing = threads only, no hex drive.
Using the hex bushing seem to raise the outlet ell a little to high to meet the intake fitting.

[JohnKY]

And interfere with the A.I.R pump. With the height of bypass ELL due to the hex head bushing.

[169INDY]

Bushing Straight Reducing Adapters
Low-Pressure Pipe Fitting, Galvanized Steel, Bushing Adapter, 3/4 Male x 1/2 Female NPT
Mcmaster-Carr
PN    4638K357