I am gonna be running a 2001 USDM B15 roller rocker block/head with a B14 intake manifold and P10 ECU. The ECU allows a redline of 7500 rpm, but the roller rocker isn't meant to be revved into the 7000s... Supposedly JWT valve springs would raise the safe rev limit of the motor but they're discontinued at the moment. I'm wondering if I could pick up some BC springs/retainers meant for a regular DE and put them in the RR engine or if the RR needs springs of a diff spec?

Another solution would be to not rev like a madman? My NX has the rev limit removed! (stock would be at 6400rpm), and I've driven my motor hard for about 60000Km, and it hasn't blown up yet :)

If it's a track car then i guess it's a bigger problem...