Quote: Lunati 513/533 Initial is happest at 20 degree's yes new valley pan i never reuse a gasket. I think the problem is the pump. easy change to find out.
ALSO! Before bolting the new pump on, determine the impeller-to-housing clearance. There have been reports of interference and/or excessive clearance with some combinations. I would think the most effective is for the impeller to be as close as possible to the housing, w/o interference.
As stated by another poster, the design of the 440source impeller does not look like it would flow well. Report back with your results!
