a motor built by SGP...kicking around the idea of getting JWT mild cam and springs ..I wanted to know if these parts will get me another 30rwhp .. can anyone speak based on experience because if it doesn't give me that much rwhp --it will not be cost effective to me .. I have sport 600's with inconel manifolds plus your basic stage X+ bolt ons .. i did a search and found 317 posts ..none speak to the gain just from these cams alone ... i don't want bigger cams than these because I don't want to lose the VTC ability ... thanks in advance for your feedback !