Well I put the new 2.5 motor in my yj and started to break in the cam the first run. Rpm's were 2500 to 3000 and i was like oh hell ya! Then the fuel pump relay I put in bent boom and rpms dropped...... so did a cam lobe and I was like f**k! I'm probably going to put the stock grind cam back in and pray it likes new lifters. craaaaaaaap