Comp Cams is telling me that my stock L98 timing chain has advance ground into it, and that dot to dot isn't really a true zero degree install.

I find that a little odd, but it doesn't seem like it would be impossible. I don't have a degree wheel, so I don't have a way to verify one way or the other. Has anyone else ever tested a stock timing set?

 

that is interesting and thats the first time i've heard it. My timing chain was so worn and stretched that i couldnt and wouldnt reuse it. I got a 9 way adjustable one much better

If it does have any advance ground in its probly only 2-4 degrees...but i highly doubt GM would do that. what comp is probly saying is factory tolerances allows several degrees off true zero to be used. SO a factory straight up degree mark may actually be anywhere from 3 degrees retarded to 3-4 degrees advanced. I would think tolerances were more along the lines of +- 2 degrees but you never know

Then again, i've read threads where aftermarket timing chains, even those by comp cams have been off a few degrees