newbee - LS6 what is the best or really good spark plug tha could be used and what should be the gap. I have read the AcDelco P/N 41-985 comes factory gaped at .040 or .060 ?? and should not be changed. Also been told the NKG 55's gaped between .050 and .060 are also good? Help

 

Definitely try that MGW shifter, it'll fix you right up