SFriedog Roller lifters have become a common thing in the LS1 or any pushrod engine still being made. Roller do break and put bearings all over the motor, if you are luck the
oil pump will pick them up and only break the pump or gear for the drive. You have alot of motor out there with lifts of .650" and more. This is what is killing these motors, not the roller setup. A custom cam with a lft of 600" should have no problem with the problems you refer to. I call crane and got a custom number with 565"-583" with 110 lobe seperation. Great tork cam with good Hp. You have a Danny bee timing set on one of your motors? In the beginning timing belts where breaking and not INSTALLED right causing damage to motors. Now most overhead cam motors run them and turn 9000 rpm with no problems. The belts last 75,000 miles. I am going with a Danny bee timing set on my new motor. Put the right parts togeather and set right, there should be any problems. 1 other point the roller cam and flat tappet have 2 different design lobes. There is alot more friction on the flat than the roller, roller also oils the cam lobe and wheel, flat tappets rely on oils splash. I would perfer anyway 600 of tork to 600 hp.
Rick Lake