I was looking at the PAW catalog last night (my Christmas wish book) and saw reverse flow water pumps for big blocks. I am curious why reverse flow would be desired and what other modifications this requires? Is this for racing only, or is it a good street modification? Anyone have a BBC with such a modification? As always, thanks for your help. This is a great list.Reverse flow is mainly used on race motors. Its purpose is to even out the heat distribution between cylinders. The normal flow is into the front of the block, through the block, into the heads, out the intake and into the radiator. This creates hot spots in the rear cylinders and around the exhaust ports of the heads. By reversing the flow, you are cooling the heads first (which is where most of the heat is generated) then cooling the block. Most of these systems also use 4 corner cooling so that the front & rear cylinders keep an even temp by returning the water from the front & rear of the intake. It's probably not worth the hassle for a street car. Some more details can be found at www.shogunsystems.com. (I think that's it) Reverse rotation pumps are needed with serpentine belt drives 'cause they turn the water pump counter clockwise.
Larry
Hope this helps.
BL
