Stroker specific cams?

12many said

I'm still trying to figure out what a Chevy lobe is, and a Mopar lobe is. Ford lobe anyone? Specifically, where's a diffinitive chart, or data....something credible.... that shows duration at .200", .050", etc...
and lift of said lobe that shows when the lobe becomes either that dreaded god awful Chevy lobe or the awesome almighty Mopar lobe? Seriously, the Chevy lobe nonsense is tiresome. Slow ramp lobe up to very fast and everything in between. Choose your specs accordingly.

Click to expand...

It's not all nonsense. It's pretty math specific. A Chevy lifter is .842 diameter, a Ford is .875 and the MoPar is .904, so that's where the lobe difference comes in.

The bigger the lifter, the more lift per degree of rotation you can have. And it is a case where most of the time, (again...MOST of the time so someone doesn't come along and try and stir ****) you are better off with a faster lobe.

Why? Because you can cut the seat duration way down, still get the at .050 timing you need for your application.

If you are building milquetoast stuff then it mostly may not matter. Even then, I can't see why you'd not take advantage of the bigger lifter.

That's why you don't see many Chrysler's in some of the circle track crap out there. You have to run an .875 lifter. So why bother. In fact, before NASCAR went back to roller cams, they had lifter diameter rules (everybody got stuck with the .875 lifter) and bore rules (Chrysler could easily go 4.200-4.220 while a Chevy at 4.185 was maxed out...so everybody got the 4.185 bore size) and rules upon rules upon rules.