Originally Posted by @#$%&*!
It sure would suck to find out the problem is just a lean carburetor.
twocents

Originally Posted by 8urvette

Do i just replace everything??????



Funny side note... already been there and done that.


OK, 440source housing and pump from my 540.

Takes a lot longer to get to temp, then hits 220, comes down to 180 and fan shuts off. Heats back up and hit 220 fan is on and brings it down to 205* just sitting idling in my carport. Stays at 205 for a long while. And its 15* warmer today than yesterday.

Conclusion at this point is the smaller port 440source housing has tighter tolerance to the pump veins, thus moving more coolant.