How do you know the one Z has Stillen cams in it? Did you buy them and have them installed or did someone tell you this when you purchased the Z? Either way do you know what cams they are? Knowing Stillen they are more than likely the exact same thing as JTW cam’s and JWT offers a Sport cam, a 400 cam, a 400+ cam, and a 500 cam. Only the sport cam can be used with the stock valve springs and components all other cams require a valve spring upgrade because of the lift duration and clearance of the cam. I would not call the sport cams worthless however I can recommend better supporting mods for the money on an NA. The only benefit that sport cams will provide is a small addition of power in power in the middle of the power band when the variable valve timing is being utilized. In my personal opinion based off of my experience with the Z32 the best modifications for maximizing non turbo power in order are
1 Pop charger and under drive pulley.
2 ECU upgrade
3 Cat back exhaust
4 Clutch and flywheel
And if that’s not enough power
5 A 75 shot of Nitrous oxide
Stillen headers and upgraded cam shafts are so ineffective the cost really falls short of the investment on the NA sorry to say.
