[Len66]

I think the running hot problem that I have been having is due to the March pulleys that I'm running. Cooling system was pressure checked and a leak down test was done on the block all checked out good. I have read the other threads on here about the under drive pulleys. Being I am running high flow water pump and high flow thermostat, I think I'm flowing too quickly. I currently have the high flow water pulley system on the car.( 6 rib serp). If anyone here has an underdrive pulley 6 rib that would like to trade? These pulleys are only 2 months old. I'm going to put the old v belt pulleys on and see if my temps come back down.



Len

 

[theracer]

Under drive pulleys are great if your running high rpms mostly.
I had them also and just changed the crank pulley to match the water pump pulley ( 1:1 ratio) helped a bunch for town crisin!!!

 

[Len66]

I was also wondering, would I have to change to the small crank pulley or do you think I could just replace the water pump pulley to the bigger size and still be ok.. I noticed on the underdrive set the crank is small than what I have. ??

thanks.
Len