That sounds nutz , got over 12,000 miles on a flat tappet cam , wtf is the purpose of using a roller cam if things wear so quickly ?? Does not make any sense , the whole purpose of roller cam/lifters is to have lower maintenance and longer life . put over 450,000 km on a roller cam v-6 Fraud , never had a problem .Another thing, how long do the solid rollers typically last? I probably drive the car about 3k miles a year, I understand that you check the lash every once and a while, but do the rollers wear out in let's say 10k miles and need to be replaced or rebuilt?