Need Help: Water Pump Removed - Heating Issue?

[camaro1969]

Background: 1969 Camaro, running a 350 sbc, aluminum radiator with electric fan (sucking air from grill inwards), 180 degree thermostat. While driving, I tend to start overheating quite quickly. Within 5 minutes of my drive, i reach 180 degrees, within 20 minutes i am about 200, and if I am idling in traffic at 200, I will reach about 220-225 within 4-5 minutes.

To find the bottom of my over heating problem, I pulled my water pump to see whether it could be a counterclockwise rotation on a v-belt system.

Are you able to tell by the picture whether the water pump i have is the correct water pump for my application? I run the belt on the grove side of the pulley and the pump pulley rotates clockwise (looking from in front of the car).

That being said, the water pump is a generic china brand, Dynapak np1063, I couldn't find more details, other than there is a "B" casted in the inside of the water pump housing. *see image* Can you recommend a good water pump replacement, american made?

Thanks

https://www.dropbox.com/s/lihd2fztdt...531_094530.jpg
https://www.dropbox.com/s/8aickcoph2...531_094538.jpg

[Vince@Meanstreets]

Has it ever boiled over?

[Che70velle]

Vic, those numbers aren't insanely uncommon. My z06 corvette was the same way. Does the car eventually boil over?
What do you know about the engine as far as over bore, compression ratio, and ignition timing? Does your radiator have a shroud on it, or just a fan mounted on the core?
I can't help you at all concerning the water pump.

[camaro1969]

it has never boiled over. the hottest its got to was about 235, and i got it home just in time to let is cool down.

overbore is .30, originally a 327 block. I do not know the compression ratio and i haven't checked the timing, i can check.

fan has a shroud build on it.

[Vegas69]

At the rate your temp rises, I bet your cooling fan is undersized. If the rest of your cooling system checks out, better electric fans or a gm clutch fan and shroud are in your future. Two twenty five in traffic is just to hot for an old school small block with a carb.

[GregWeld]

Here's what I always ask guys when they come to my place with an "overheating" issue.


What are you going by for your temperature?


The gauge?

An infrared gun that has taken temps on the inlet and outlet of the radiator to see if there's a temp drop?

Does your "gauge" match the readings of an recent assessment of the motors temp?


WHERE in the motor is the temperature gauge? Head? Block? Near Thermostat?


If the gauge creeps up in stop and go traffic - or at a stop - does the gauge show immediate cooling off if you begin to move? Or does it stay high?



What does the gauge read - say - cruising along at 45 or 50 MPH?