colt cams verus crower cams

can someone that know please give the differences of the crower 403’s and the colt cams that are close to these. would i need to upgrade the valvetrain with cams. they will be going in a b20z engine with a skunk2 intake? thanks chris


intake - 262 duration, .423 lift (.006" clearance)
exhaust - 262 duration, .410 lift (.007" ")

email me if you still have any more questions on colt cams. (I’m a direct distributor)