How much clearance for valve springs?

[SappySE107]

I will have .074" clearance before coilbind on the comp springs I have on the store. I though it was around .060 clearance min but id like to make sure.

Also, if you consider preload on the lifter, which aren't solid, I should have another .020-.040 preload from the pushrods. How much lift should I be losing from the hydraulic lifters?

[AaronGTR]

According to comp the springs are designed for max of .600" lift, and they are installed at 1.8" on a LSx engine so that would put them at 1.2", and comp lists coil bind at 1.14" so I'd say yeah .06" is minimum clearance.

Don't know about your lifter question.

[SappySE107]

Awesome, then im all set with these springs without any head modification using .566 lift.

[geoffinbc]

COMP recommends a min coil bind clearance of 0.060" other are more consertive at 0.100"