Looking at their web page and I see that part # 5475 is the Mercury Marine Hydraulic roller lifter, is this the lifter most people use? I would think if Merc. Is using it, it has to be pretty good.

4603 is what I use

#5475 is the dog bone lifter. These are used in 525EFI's..

Thanks, appreciate the info

Same here.

What makes 4603 superior to the 5475? Was reading up on it to try and understand the differences.

From what I just read it seems they are the same lifter, one machined for the dog bone, one for a tie bar. I'd like to hear from anyone using the 5475's

me too..

4603