Dave built my '04 200 efi,on my paramount 21, 2 yrs. ago with wsm pistons,and the thing runs great,no issues pushes that 1800 lb. hull to 60 mph,real quick,I bought a 240 sport jet block from him,and a blown promax, and he's rebuilding it with wsm's for me this winter for my AE-21,I have no reason to doubt those pistons,shane and max are both running 90+,every wknd. with their pm's.