i was wanting to know what a safe rpm range is for the gsr valve springs and also for itr and how can you tell the difference between the two?

 

ive heard that the gsr have dual on the intake side only, but i just bought a 95 gsr head that had dual on intake and exhaust springs. if anyone knows any info on this please let me know.

 

they are both dual but is there a way to tell the difference between the two

 

itr heads have dual valve springs on both the intake and exhaust side. gsr and b16 heads have dual springs on the intake only. i wouldnt rev a factory b16 or gsr head past 8200-8300. as far as an itr head goes i believe fuel cut in a factory itr is around 8600.

 

itr springs will have green(intake) and brown(exhaust) paint on them. I have had my itr springs well past 9k. but you need titanium retainers, as the stock ones will fail at anything above 8.5k.

 

thanks, as far as for the cams right now just some itr's but hopefully some toda or buddy club both are pending pms, what is you take on those two cams

 

The intake springs on a type R are Yellow for sure. Exhaust side is Red I believe.

 

if u plan on running big cams like that i hope u dont intend on using itr valvetrain. the valvetrain was not intending for that much lift

 

well the yellow turns a bit brown after time. mine are yellow/brown and green. been to past 10k many times ctr's with crower retainers. .3" piston to valve clearence. no bent valves. but that LS/vtec went down 3 months after adding crower stage 3's w/ crower springs. broke stock valve at 6k. it was all shot besides the crank and rods.