Stokes1114
I'm Awesome
No you don't have to have anything machined. The springs are stock size. Just much stronger. The machining is for the dual springsThat cam is one of the options that came up on the cam quest program from CompCams website. Grind #XR258HR. Won’t their matching spring set need to have the heads machined? Their notes section mentions it I believe. I might be interested in it, I will let you know for sure in a few days.
.. Just remembered you have vortecs so the springs won't work. The cam and lifters are the same. As others have said, comps ramps are MUCH quicker and if that's not what your looking for then stock GM cams would be your best bet.
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