If having this installed in a stock engine (no new heads or intake) I personally believe it's a waste of money and effort. In my opinion, if you're going through the hassle of having to pull all of the accessories, intake, and having to go through setting the valvetrain up, it's just easier to pull the heads and put new ones on while you're in there. Doing all of that depends on your budget of course. An E cam isn't even that great of a cam and if you are using stock heads, do yourself a favor and at least get a split pattern cam that favors the exhaust since that's the biggest bottleneck on stock heads.