Quote:
Originally Posted by Steve C.
Mark's custom oil pump has a taller gear set and larger diameter pickup that results in 87 percent more flow per revolution than a regular Melling oil pump.
Here to add fuel to the fire.....regarding oil weight 
When I was dealing with Mark regarding his oil pumps he told me that he had conversations with both Mahle and Dura-Bond engineers and he mentioned they tend to shy away from 20W-50 oil in street cars. They would prefer 10W30 or 10W40. For the most part I've always used 10W30 oil.
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And then you get into cold pour ratings to add more fuel to the fire as all 20-50's are not created equal, and that all plays a roll as well.
We could just go on and on about this or that. LOL