CHEV 216 VS Chev 235

[Phil Waterman]

Hi Guys

Will have to sort through my shop notes and photos of water pumps couple of points to keep in mind as you play mix and match.

1. Keep the relative size of the pulley in mind between the crank pulley and the water pump pulley. The really small pulley on some of the 2 hole later pumps will dramatically over speed the fan when used with stock large crank pulley. I would be concerned about fan failure. Testing the 235/261 engines on the stand it was obvious that the fan was turning way to fast. The air stream over the engine was actually pulling oil out of the oil breather. So use the crank and water pump pulleys in sets.

2. If you decide to change the pulley some are bolted on and some are swedged directly to the water pump shaft. Those are very hard to remove without breaking or bending something.

3. The water flow tests I did was to confirm that the 235/261 stock water pumps and the modified 2 hole with adapter plate had the same or similar GPW flow rates through the normal operational RPM range, they do.

Will look to see if I've got good photos of which water pumps I used on which engines and what are the differences.

Cheers Phil