Engine flush... Yes or No???

When I was suspicious my 170 had sludge in the bottom of the pan, I pulled it, put it on the stand, got the pan off and sure enough it had about 1/2" or more sludge in the bottom of the pan. It was blocking the oil pickup causing the oil light to stay on extended periods on cold startup. I cleaned it all out, replaced the rod and main bearings even though they were good, put a new oil pump in it and a new timing chain set in it and back in it went. I just now pulled it back out to swap in the hot 225 I put in a couple of weeks ago. That's the only way to safely get it out 100%.