Does anyone have information on the stock valve spring rates for the VIII or IX motors. Thanks.

 

I am curious about this as well. I have been looking on here for a couple hours with no luck. I came across this thread and know it's a few years old but didn't want to start a new one. So, if anyone has any info, please let me know. Thanks.

 

You may be able to find a machine shop in your area that has a valve spring tester. If not, if you send me one spring of whatever type I'll be happy to test them.