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Can someone please explain which type of lobe seperation is best for NOS? For examble, would one with 105 be better than one with 112?
 

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The wider the LSA the better it will work with a nitrous system or a forced induction, seeing as how nitrous and forced induction force more oxygen and fuel in to the chamber it needs more time to exhaust this extra. The 112-114 LSA give this extra time to do this. for instance my nitrous cam is 282 on the intake and 294 on exhaust with a 114 LSA
 

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The extra lobe seperation reduces the overlap period (when both valves are open at the same time). This helps keep all that extra mixture from flowing into the chamber and right out the exhaust port without being burned. It also opens the exhaust valve sooner to let all of that extra exhaust gas out of the cylinder. The extra exhaust duration also helps with this...

Good Luck!
 

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Adding duration to the exhaust side by opening the valve earlier is far more effective at increasing exhaust flow than leaving the valve open later and increasing overlap. Therefore N20 cams are usually ground with a wide centerline angles and then are run in an advanced position to put the intake lobe back where it likes to be for maximum torque which also has the effect of opening the exhaust valve sooner. These types of cams also work well on non-nitrous engines that have less than optimum exhaust system specs, whether it's poor port flow, catalytic converters, or shorty headers and full length street exhaust systems.
 
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