[Bill Eveland]

Mine had some grinding done to it on the backside at the bottom, i'll post some pics later, I figured it was for extra clearance.

[Jack Gifford]

Bill- your post#19 sounds to me like a good plan.
Yeah, I remember some minor tweaking on the Hurst mount, but certainly nothing to complain about.

[Bill Eveland]

badlefthand and whoever, this pic shows the backside and where it was ground off some by the fuel pump area.

[Jack Gifford]

Thanks for posting the picture. I'm surprised at how much it differs from mine. Does yours have the 'HURST' stampings on both sides of the front? I thought mine had a number or a 'Pontiac' stamping, but can't find any now. Have you test-fitted it to an early Pontiac engine?
Although I said I had "tweaked" it a little, I can't really find any such evidence now.

[badlefthand]

Hurst must have several designs of these. I wonder if the 55-57 fuel pump clears.Sure looks differant fom 59-60.Anybody know?

[Bill Eveland]

Originally Posted by pontiac jack

Does yours have the 'HURST' stampings on both sides of the front?

Jack, mine is only stamped Hurst on the rh side on either side of the mount, I havn't tried it on an early engine, I'll have to wait till I can get a 60' cover on my engine.

I may just go with an electric fuel pump, but does anyone know if the 60 and 66 fuel pumps would interchange with the timing cover differance.

[Bill Hanlon]

Pontiac fuel pumps are pretty interchangable. The clocking of the lower part of the pump may be off, causing the fittings for the fule lines to be pointing the wrong direction. The mounting flange and the pump arm seem to interchange between most. My '57 (GMC) Pontiac is currently running a Pontiac fuel pump from the late 60's or early 70's that has a third connecting for a return to the tank. I just blocked it off. The pump died during a road trip and this was the only pump the FLAPS in the small East Texas town had. Been on my truck for years.

[Bill Eveland]

Thanks to Bill Hanlon and Poncho60, I got my stuff today. There is a little work to get the mount to work, just a little grinding here and there. The grinding I thought that was over by the fuel pump side ended up being on the front on the lh side in the pic, probably for clearance for the lower radiator hose?

[Bill Hanlon]

Glad I could help.

Looks like you have already cut the timing cover for a late model seal.

[Bill Eveland]

Yes Bill, it's already been machined for the newer seal.

Here's a few more pics, someone asked if there was enough room for a 55 type fuel/vacuum pump. I dont have one here to try , if these pics may help? It really doesn't look like it would fit.

Is the 4 bolt water pump set up shorter than an 8 bolt set up from the engine out?

Also I hope this cover fits over my double roller timing chain. Any reason why it wouldn't?

[Bill Hanlon]

I have a double row chain under the '58 cover on the front of my '57 347.

Your question "Is the 4 bolt water pump set up shorter than an 8 bolt set up from the engine out?" I have a 4 bolt pump. Where do you want me to measure?

[Bill Eveland]

I have a 4 bolt pump here somewhere , I was wondering If I would be saving any room with the 4 bolt set up over my current set up. From the engine to the outer flange of the water pump. Might be harder to measure in the car/truck.

[Bill Eveland]

I found my wp, they are both out about 6 1/4" from engine to pulley flange . At least knowing that my current wp pulley should work than.

[Bill Hanlon]

Does that mean you don't need the measurement? I have a '57 timing cover squirrelled away in the attic over the garage that I could easily measure from the point that it mounts to the block to the flange of the water pump. For that matter I think I have a 4 bolt pump I could mount on it.

[Bill Eveland]

I think i'm ok the the measurment Bill. I saved the wp I took of the 287 and mounted it up on my cover just for the measurment, I saved the core becuase it still had the cast impeller in case I couldn't find a rebuild that only had a stamped impeller for reverse cooling.

[Bill Hanlon]

That "reverse cooling" water pump is an old wive's tale. Just a different impeller design. Still turns the same way. I ran one for a number of years with no cooling problems. Changed it out 3 years ago when I put on the new-style front seal and still have it in the garage as a spare.

Below is some info I submitted to the Yahoo Pontiac 1950's e-mail list 3 years ago:


I ran across a really good manual titled "Fans Reference Guide" by
Ontario Power Generation while doing some research at work. I realize
that this article is speaking to fans and air, but a fluid is a fluid
and I see no reason it doesn't apply to water pumps as well. It
discusses four types of Centrifugal Fans, which is how a water pump
operates. They are Airfoil, Backward-inclined, Radial and
Forward-curved. Some of them look "backwards" to dummies like me, but
they all have advantages and disadvantages.

Go here

http://www.energyefficiency.org/eece...a?OpenDocument

and then click on the pointer to the .PDF file.

By the way NAPA's part number for the cast iron impeller pump is 58594.

[Bill Eveland]

58594 is the clockwise cast iron impeller. Wouldn't I want the 58298 with the ccw stamped impeller since i'm not using reverse cooling?

[Bill Hanlon]

Reverse cooling (Pontiac marketing reffered to it as “gusher valve cooling”) has nothing to do with the direction the pump turns or the direction coolant flows through the pump. The difference is that coolant exits the pump and enters the heads first on the "reverse flow" systems, but exits the pump and enters the block first on the conventional system.

Safari Larry has a few pages from a Pontiac document that explains this on his web site at
http://www.pontiacsafari.com/
Once you get there click on "Pontiac Garage" on the left side of the screen and then click "Pontiac Engine Cooling", the eighth item down the page.

[Bill Eveland]

A member who was looking for a Hurst mount got one and sent me a copy of the instructions. Thanks Jerry. I still have never seen the other mount it lists for the newer engines, 61-66.

[IMG][/IMG]

[Bill Eveland]

Hi guys, I got this sent to me as well, shows the 61-67 mount - for anyone like me that was wondering what it looked like. Must have been from a 67' catalog , the mount will work a few years past 67. What year is the side spacing the same? 69?