Warranty don't do chit when your missing seasons... that's why I went 540 not 565 in new engines using the 4.25 crank I might have been ok but was worried about rod angles.

The difference in angle between a 4.25 and 4.375 is about 1.7 degrees

Compression height goes from 1.29 to 1.2275 which both give you plenty of piston.

Getrdunn im building a 565 with a 4.375 stroke right now that I'm going to be selling tall deck

I've done lots of 4.375 short decks, some are over 10 years old and have been in for a few freshen ups. I don't see any more wear that could be attributed to the little extra stroke then I do on a 4.25 stroke. On endurance stuff that's going to run a decent amount of boost 12+, I usually go with the 4.250. I don't know if it really matters, the 4.375 would probably be fine but I like shorter stroke and bigger bore given the choice. The other consideration is piston availability is usually off the shelf for the 2590stroke and you need to do a pin height change on the 375

He said the skirt was very short and the pin was pretty far up. He also used a diamond piston with coated skirts and gas ports.

My new boat has short deck 572s in it. Been in there for quite a few seasons and one freshen up no issues more than any other

I think we're gonna be doing similar builds. You going NA or SC? I sent you a pm last week regarding cam. I need to stick with 9.8 for clearances etc.

Any suggestions on Pistons with the 9.8 deck, 4.375 crank and 6.385 rods? Wondering what shelf Pistons to be looking for and what pin heidth also - 1.21, 1.22? Would like to avoid custom Pistons however If need be not a huge deal.

Good question on the pistons.

For instance, my 572 tall-decks have a 6.70 rod. Oher than some flat top pistons options, dished pistons were like non-existent off the shelf and I had to go custom.

In retrospect if I built it from the ground up I would have gone 6.535 and I don't think the longer rod made all that much of a difference in the rod angle/wear and dwell benefit.