Cam comparison

I run a Comp Cams XR274R Solid Roller in my 499" RB street engine. 236/242 @ .050" .564"/ .570"

Xtreme Energy 236/242 Solid Roller Cam (3 Bolt) for Chrysler 383-440

Just remember the way the lobes are shaped on a roller vs the lobes are on flat tappet cam changes the way it works.

While this might not sound like a big cam to those who aren't familiar with roller cams it's effectively 8-10 degrees more duration than a flat tappet cam of the same duration.

There is nothing worse than a poor performing engine because it's over cammed, or worse yet someone using a Thumper cam because they want it to sound mean.

If you want a big block that runs extremely well, then I would suggest using a XR274R cam.

Tom