nitrous cams?
instead of having egg shaped lobes, the entire cam lobe is shaped like a circle.
this lowers frictional loss, since the lifters do not have a egg shaped wall to climb up and down with every two engine rotations.
(if you have to use the word "best" in any technical question, you need to re-define the question more accurately before you can get any kind of usable or accurate response.)
Anyways, take a pick
218/224, .563"/.568", 114lsa
220/224, .564"/.568", 114lsa
220/226, .564"/.570", 114lsa
222/226, .566"/.570", 114lsa
224/228, .568"/.571", 114lsa
224/228, .581"/.588", 114lsa
224/230, .581"/.592", 114lsa+1
224/230, .568"/.573", 114lsa
226/230, .570"/.573", 114lsa
226/230, .570"/.592", 114lsa
228/232, .588"/.575", 114lsa+1
228/232, .571"/.575", 114lsa
230/234, .592"/.598", 114lsa
230/236, .592"/.602", 114lsa
230/236, .592"/.602", 115lsa
232/236, .595"/.602", 114lsa
232/238, .595"/.605", 114lsa
232/238, .595"/.605", 115lsa
234/238, .598"/.605", 114lsa
234/240, .598"/.609", 114lsa
236/240, .595"/.609", 114lsa
236/242, .595"/.610", 114lsa
236/242, .595"/.610", 115lsa
238/244, .605"/.612", 114lsa
238/244, .605"/.612", 115lsa
240/244, .609"/.612", 115lsa
In general though you want high lsa with more exhauste duration and more intake lift.
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