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I have an 01 ZO6 with the following mods. I usually only drive it on the weekends, so I figured when it turned over slow the battery was just low. But I noticed it kinda turns over slow even after I have driven it a long distance. The battery voltage seems to be good. So I was seeing if a MSD ignition control would help. Thanks for the input.
Block honed
new GM pistons/rings & rod bearings
PRC 5.3 stage 2.5 heads
PRC 228r cam
PRC hardened pushrods
PRC dual valve springs
LS2 timing chain
Dynatech powercats
Vette Doctors dyno tuned 426rwhp/408rwtq (DD dyno)
Dynatech stainless LT headers & x-pipe w/hi-flow cats
Optima Red Top battery
I would tend to think the battery was simply weak, or the starter is having a hard time underload. Perhaps you could just try another battery before moving towards the starter.
All the other components are secondary to the turning over function.
Just my opinion.
Thanks for the help. Figured out the battery was not getting a full charge. I borrowed a battery charger and charged it overnight, it starts great now. Thank you for the help.