Water Pumps

[Guest Russ240z]

What is the difference in short and long style water pumps? Is one prefered over the other? What about recommened brands?

 

Thanks.

[Mike C]

The "short" pump doesn't extend as far from the block. It uses different pulleys and brackets from the "long" pump. Within the short pumps are several varieties. You have the 5/8" pilot of most and the 3/4" pilot of some Corvettes. The newer reverse rotation short pumps have a different height as well and require shimming or grinding to work with older brackets/pulleys as well as changing the impeller to standard rotation. Within the long pumps you have just standard and reverse rotation. I usually just run auto parts store pumps with no problems. There are some will known better pumps, Stewart and Flow Cooler, but they are pricey. I have a friend who has run the Edelbrock pumps, but both failed. You can't go wrong with genuine GM parts, but you can go broke!

[Guest Anonymous]

The only difference is in around or about 68 I believe it was, they changed to the 'long' pump, it probably suited the motor better as right around then chevy was getting into some longer front end design's. Check out a 74 or 75 monte sometime, the shroud on the fan is so deep its incredible.

Either will work for swaps, using a 'long' pump doesn't even get close to the radiator in the JTR method. You just have to match your accessory mounts with whichever you go with, long or short. Aluminum will save some weight on the engine, but will make your wallet light, the cheapest is over a hundred bucks for a long aluminum unit. If cast iron does it for you, I agree with the above, I put the old parts store pump on the car and for a driver it works great, last a long time and is CHEAP.

 

Regards,

 

Lone