I am going to start a new engine build for my 26 RPM Redline cat. It currently has a 598 chevy tall deck with a new Whipple 4.5l SC. the ring life has never been as long as I would like. usually after about 30-40 hrs, the leakdown drops from 5% down to 20% or more and the power is dropping somewhat. with the new build I am planning on a shorter stroke, maybe 4.250 or 4.375 in an effort to get some longer ring life and less piston scuffing on the thrust side. I may go to the trouble of all pistons oilers to the block if this will help. with only about 555", I will have to add some boost to equal the power of the 598. it might even be a little better since I should be able to turn it a little tighter with the shorter stroke and going to .903 lifters, either solid or hydraulic. since the merc 1075 has a 40 rebuild time, it may be difficult to get to my desired 100 hrs even with the short stroke. what do any of you think of this combo? the old bowtie 598 is 10 yrs old and has been built 8 times almost always with new pistons and a hone or bore. that is why it is at 4.600. it started at 4.500.