i have a tight lash solid cam with .590in./.610ex.lift.i want to run 1.6 ratio rockers on the intakes.i have a new set of dual springs with a max lift of .625.will these springs work?it seems sorta close.i lost my formula for figuring the added lift of 1.6 ratio rockers.thanks much.

with 1.6's I come up with .629in .650ex

Not sure, but I think you just divide the .590 lift by 1.50 (rocker ratio), then you multiply it by 1.60. Using the 1.6 rockers should give you an intake lift of .629. Not 100% on this, so hopefully someone else will chime in.

Yeah, that's how it's done. Divide by 1.5, then multiply by your desired rocker ratio (1.6 in this case).

so i guess in a nutshell the .625 max lift springs won't work with .629 cam lift on the intakes?
or will using + or- valve locks(or is it lash caps?)help? i'm chompin' at the bits to get this bad boy 73 chevelle going.i've got lotsa neighbors to scare! :D

It would depend on how much room till coil bind you have at .625 lift and also you should subtract the valve lash from your total lift figure. Let just say at .625 lift you have a .100 till coil bind, so with .629 lift you would only have .094 till coil bind which is usually OK. i would be more worried about the exhaust with .650 lift, even if you had a .100 till coil bind that woukd only leave you with about .050 plus the lash. I would check with the valve spring manufacturer if that would be OK. Hope this helps.

i'm going with 1.5's on the exhaust so thats not a worry.thanks for the great advice! :cool:

i'll assume in order to check how much room i have till coil bind at .625 lift and subtract the lash i have to do this with the heads on the block? redface.gif i'm a newbie engine builder but i learn pretty damn fast. ;)

There should have been an instruction sheet with the valve spring with all the specifications, it will tell you installed height, seat pressure, open pressure, rate per inch and coil bind height.If you do not have this info you will have to take the springs to a machine shop with a spring tester and they will be able to check them for you.

seat pressure and height: 120# @ 1.875
open pressure and height: 394# @ 1.175
solid height: 1.08
my springs' specs came from the catalog,they didn't include a sheet in the box. :(
is this enough info for me to find my answer? redface.gif
thanks again for your help..i wanna learn this! graemlins/thumbsup.gif