According to Brian, the reasoning behind the Chevy lobe was the less aggressive valvetrain motion to handle the sustained time at RPM. Not just RPM, loaded RPM. Closer to circle track than road race or autocross.
How much of a difference is there to be had playing with LSA to optimize the 4500-6000 range? I do feel inclined to get back up to the .600 lift line with the 1.5's, but there is a healthy increase in duration that comes along with that. I'd be at 280° @ .050. to get .590".
Mopar Lobes:
#6587: Adv. 289°, 263° @ .050, Lobe lift .404, Lift w/ @ 1.5 .606
#6588: Adv. 293°, 267° @ .050, Lobe lift .411, Lift w/ @ 1.5 .617
Interesting thing I just noticed: My current 6333 with a 1.6 has .608" with 268° @ .050. Almost the same as the Mopar lobes with 1.5's.
The cam you have has enough duration , but I would look at 106 to108 lsa & keep the mild lobe, it will work !!!!! we always ran 106ish lsa in our Sprint cars for that coming off the corner power band, it will like the tighter lsa
