gearbanger

those behives seem cool.. the guy thats porting my heads is inspecting the springs on the heads and the after market ones i got... is there a down fall in putting shimes in the bottom of the springs to change the rate? the machine shop guy said something about that. im not sure if i miss heard him or not lol..

jtmustang

what cam first before u start swapping and reswapping springs............

Portmaster

In most cases you shim the spring to adjust the installed height of the spring after grinding the valves. After doing a valve job the valve sits just a little lower in the seat because you have taken material off the seat and the valve. You would add that same amount to compensate for the valve stem sitting higher. Also when installing New valve springs to your heads you may need to add differant thickness shims until you get the Installed height right for that spring. Under no circumstances should you install a shim to a weak spring to compensate for the weakness. That could bring you into coil bind and destory the cam, lifter, pushrod or rocker. Or any combonation of all or some of the parts.

gearbanger

i have not chosen a cam yet. what we are doing now is testing the springs and see what we got. if the springs are not going to work with the cam that we are trying to match then ill get the matching springs... thanks again for the advice portmaster.