Does anyone know how much lift the stock valve springs can hold before valve float occurs?

I know JWT S4's have a little over 11.5mm of lift and teh stock valve springs are fine with these cams!

I have the S4's and it sounds like the valves start to float after 7500. I want to upgrade to the JWT springs and retainers.

from what i remember andreas sayiny the stock springs are good for at the most 8,000. but louis i have my stock springs from my gti-r if you wanna take them off of my hands, :D

jimmy
1996 200sx gti-r motor
http://www.eiptuning.com/projects/200sxser1stpage.html

Wouldn't float be a function of ramp also, not just total lift? If the S4's had a really aggressive open and close profile they could probably make the valves float, but they were designed to work with the stock valve springs.

This is just what I think, not what I know for a fact. So it could be wrong.

I dont know how much JWT's springs sell for, but
if their over $240, then I would look at these. There supposed to be able to handle high lift long duration cams, there also used in Todas GT300 sylvia.
http://www.todaracing.com/sr20_valve_sp.jpg

I never said that stock springs are good for 8000 RPMS. That woulld not make any sense.

ok then i must have misread/mis heard it somewhere. appology's dre.

jimmy
1996 200sx gti-r motor
http://www.eiptuning.com/projects/200sxser1stpage.html

Cams were ordered today along with Greddy valv springs.I guess I don't need to worry about that anymore!