I am about to Turbo my s2k looking for 350-400 whp to start with. Next thing on my checklist is building the head a bit to prevent valve float or any damage. A while back i bought this spring kit from someone who got me a good deal on it: https://www.supertechperformance.com...lve-spring-kit At the time i was not aware of some of the premature failure stories for titanium retainers. I have black nitrated ss valves from supertech as well as the seals, and the dual springs from the kit. My question is for a daily driven application, would i have to worry about the titanium retainers from the kit wearing out quickly, and if so will stock ap2 retainers be alright with these dual springs. And another thing is i forgot to buy the keepers. Are oem keepers going to be alright with a stronger spring and the new valves or should i look into keepers from supetech or another company?

 

Run OEM entirely

 

Youre saying leave the whole head stock?

 

Search for thread in which Billman reports his opinion re leaving the head stock entirely. My memory is that Billman recommends using all OEM parts in head, and don't shave head.

 

titanium retainers have a much shorter service life than oem retainers, most people don't realize that. You will be swapping them out more frequently as they gall easier than oem parts, you just have to decide if the extra effort and cost is worth any slight benefit you might get from weight savings, since the oem parts don't float up to 9300 rpms I don't see the benefit.

 

Ti retainers don't "gall" against the valvespring - they're simply much softer than a hardened spring steel, so any slight relative motion between the retainer and spring like what occurs at high RPM will wear away the Ti retainer. Stock steel retainers are much closer to the valve spring hardness, so there is much much less wear on stock retainers.

 

It would help to know what year you S2000 is. If you have an Ap2 then leave it alone. If you have an Ap1 you should replace the AP1 stuff with AP2 parts as they are an improvement.

 

Why do you want Ti retainers?

 

Titanium has a shorter service life when compared to steel. Keep the steel retainers. If you're AP1, change them out.

 

to AP2.