Lunati 60406 vs PurpleShaft P4452761

It'll perform extremely close but better than the Purple cam now. The biggest key here is cylinder head flow and the abilty to accpet the lift of the new cam. Also, at .494 lift, a bowl porting is a real nice plus.

The extra spread in durations are also a plus. The stock head or bowl ported head to a lesser extent (hopefuly) has a not so great balance ratio between them. The extra exhaust help the engine breath in better and fresher air and fuel charge. More of the incoming charge is fresher since more exhaust is exiting out. This is like adding intake duration without the penalty of adding rpm to the operation.

Due not that the difference will be mild and the butt dyno may not think much of, if at all, about any gain worth talking about. But also relize that it should very well be a more effiecnt engine making more power. Tune it well. I'd bet you'll use less gas as well.