Valve Spring Installed heights

there's no one set install height. depends on the following:

- valve spring coil bind height
- cam lift x rocker ratio is your theoretical lift

I like to set up springs .050 to .065 off bind based on full lift. I use valve lash as a buffer, so I don't use it in the equation.

Due to deflection and pushrod angularity, you will not achieve the "theoretical" lift number you come up with multiplying the cam card lift by mfg rocker ratio.

I highly doubt with a BAE 6 you are going to use too many shims. If you are running a dual spring, a locator is recommended, and the thinnest is a .030. You need to run at a minimum a .015 shim.

 

Install height -

Not saying you are making this mistake, but I have seen more than one new team over the years calculate install height incorrectly.

spring install height is the distance between the seating surface of the retainer and the shims.

Like I said I have seen it more than once where someone uses shims to get a target pressure like 450, and includes those shims in the install height number.