What is the max cam lift for these 2 valve springs?
Thanks
---------------------
911 comp springs

Installed Height (in) 1.900 in.
Seat Pressure at Installed Height (lbs) 122 lbs.
Open Height (in) 1.400 in.
Open Pressure (lbs) 309 lbs.
Number of Springs Per Valve Single
Outside Diameter of Outer Spring (in) 1.524 in.
Coil Bind Height (in) 1.200 in.
Damper Spring Included Yes
Spring Rate (lbs/in) 373 lbs./in.
Inside Diameter of Outer Spring (in) 1.110 in.
------------------------------------------------------------------------------------------

99839-16 comp springs

Installed Height (in) 1.800 in.
Seat Pressure at Installed Height (lbs) 121 lbs.
Open Height (in) 1.300 in.
Open Pressure (lbs) 298 lbs.
Number of Springs Per Valve Single
Outside Diameter of Outer Spring (in) 1.500 in.
Coil Bind Height (in) 1.130 in.
Damper Spring Included Yes
Spring Rate (lbs/in) 354 lbs./in.
Inside Diameter of Outer Spring (in) 1.086 in.

If using 1.5 rocker ratio with .060 coil bind then .426 max lobe lift for #1 & .406 max lobe lift for #2 , this does'nt account for lash or valve train deflections.

you need to know your installed height of your current valves retainers and locks setup..
Then you would take this number and subtract the coil bind number. Lets say it is 1.90 minus 1.2 which is .700 lift max....but you need too add .050 before coil bind to be safe...so .650 lift cam no problems at all.

If were talking valve lift @ the installed heights as listed , then #1 spring @ .050 CB .650" lift , #2 spring listed @ .050 CB .620" lift.

I prefer to use .060" to CB.

Thanks guys
Got my email from comp and they say 911 is .640 lift.
I thought the 839 springs were more lift, glad I asked.