Roadchaser, I been around HD since I was knee high to a grasshopper, still now at 55 yrs old I have a love/hate thing going on.
The EVO has followed the pattern of all HD since 1903.
They put out a product it has problems they iron out the problems then move on to another engine design.
The EVO came out and for the most part was trouble free other than the sealing system between the case and the barrels... ie leaks.
HD engine cases from 86 thru to 93 suffered from bad castings and poor, pourous cases in fact they were down right crap. after 93 -94 they resolved their case problems. I am sure they had to because they were working on the twinkie engine. Any EVO manufactured between 93 and 99 should be free of casting problems. Enjoy the engine it is a great engine and the aftermarket will be build parts for years to come.