Im aware that the shims that come with the 99893's are apparently weaker than most, so if I went that route I'd use Comp shims.

What's your experience with either/or?

 

The 612s did not require any shims and slid right on. No issues with them so far.. over 1K on the setup. I saw too many conflicting post regarding the the 893s and if they worked on stock heads or not. Otherwise I would have went that route. But for 120.00 shipped to me.. I cant complain about the 612s one bit.

 

893's fit stock seats.

 

893's fit just fine. I called up Crane and they said no problem and are a direct fit

 

ex 612's are good springs i ran them for a while on my car