It kills me to spend more money and then get it in the butt. That exactly what happened to an engine I built for my son. Small .620 roller cam, set of 828 comp cams roller lifters with 50 runs out of my old 408 engine. Great running engine for half a season in my sons duster running 6.54 on four occasions (10.30’s). Then a tie bar broke letting the roller turn. Totally ate up The entire engine.