1.6 rockers

They will make the cam act about 3 degrees larger in duration-it wont actually spec out larger but it will act larger.The thing is if you have heads that stall at or around .500 lift you really dont need them,not to mention the gain you will get in an average street built enigne just doesnt add up to the money spent.If your looking at every tenth or have well ported heads I would reccomend a custom grind or look at the xe high lift series or lunati voodoo that has the lift built in,its alot less expensive.