i have waited 5 years to answer a question on summit parts. i purchased a summit brand cam, installed it in the motor, and measured the lift with my dial indicator. guess what it was a .454 lift and i was supposed to have a .510 lift cam. it was in the right box though. i contacted summit and they said oh sorry, i needed this cam asap they refused to refund my money to put towards the lunati, until they got theirs back to inspect it. as i stated i was in a major hurry to get this done over my vacation, but they refused. even though i had 27 previous orders with them, totalling over 6000.oo. so i placed my order with jegs for a lunati LIKE I SHOULD HAVE IN THE FIRST PLACE. and never bought from them since. i only buy brand name parts on important parts, such as internal parts that are hard to retreive to send back in such a case.