I was toying with the idea of upgrading my 400M build with a roller cam, but really can't justify the cost. The simulator does show a significant increase in low end torque however and improving the efficiency of the truck has always been a priority. I'm currently running a Crane 523902 hydraulic flat tappet. Runs great. I've been looking at the Crane 529541 hydraulic roller. Not really sure whether it's really worth $1200 in parts and the time. Thoughts? Can't attach images, so here's a table showing the differences:
Current flat tappet sim data:
RPM Power Torque
2000 157 411
2500 205 430
3000 253 443
3500 302 453
4000 333 438
4500 349 407
5000 337 354
Roller cam upgrade sim data:
RPM Power Torque
2000 178 468
2500 228 479
3000 281 492
3500 330 495
4000 358 469
4500 364 426
5000 348 366
Current flat tappet sim data:
RPM Power Torque
2000 157 411
2500 205 430
3000 253 443
3500 302 453
4000 333 438
4500 349 407
5000 337 354
Roller cam upgrade sim data:
RPM Power Torque
2000 178 468
2500 228 479
3000 281 492
3500 330 495
4000 358 469
4500 364 426
5000 348 366