http://i16.photobucket.com/albums/b1...7/5e0a906c.jpg

This was an old 502 Mag that I had. Check out the rocks in there. This is the oil cooler if I remember correctly. ...and it also had a PS cooler plumbed before the cool fuel. Oil cooler was last in line (again, if I remember correctly).

If a PS cooler was not installed then you don't need it.
Don't see any of the boats in your sig would have PS

Which boat is it?

Took a 350 out of the scarab and putting in the 502.
Will need to fit a PS cooler.Can't think of why it's not on there.
Even if this 502 was meant as a twin install normally as far as i can remember Merc left everything on.
Anyway guess i'll go dig out a cooler.
The race boat is full hydraulic power steer,Eliminator the same,Fastlane 40 before that and Stinger 222,

I would check all coolers anyway. On mine the engine oil cooler is last in a line of the three coolers and it was almost totally clogged with seaweed and smaller bits of impeller. This was a boat we just bought with 270 engine hours.

What he said..

Backflush from far forward as you can get..

On my old 502, the PS cooler were not non-restricted as others mentioned. It had the tubes in it, just like the oil cooler that I linked to. Funny how large $hit could pass through the PS cooler, through the open fuel cooler, and end up clogging the oil cooler. But it did.

My `96 has open PS cooler, tubed engine oil cooler and no cool fuel. I still have the VST. First year of the Gen VI tho which is nice.

I'm going to fit a cooler with tubes from a 500efi.