Will the oil cooler from a hp500 work on a 555ci motor?

Run it and see what you're oil temps are. I'm guessing no , but I'm no professional ,

Capacity of oil pan makes a difference in that question

I'm no expert, but anytime you start going above stock performance I'd suggest going with a bigger cooler with a thermostat and new lines. The stock stuff is barely adequate as is.

8 quart pan

Is anyone using a 2x18 cooler on a larger ci motor?

My Paul Pfaff 565's have 2" coolers on them, but my oil temp is a little higher than I like after a hard run. If I were doing it, I would upgrade to a 3" cooler with -10 or 12 lines. You won't be sorry

I would say no to cooler, lines, and adapters, very restrictive

http://www.offshoreonly.com/forums/g...-hardware.html

I have you answer yesterday lol (3x18") good for 700 HP.