Originally Posted by
JHM2K
Can someone explain the whole "heat range colder" thing to me? If there's no detriment in swapping back to the stock heat range plugs, I'll certainly do that. They're gapped at .36, not .40 like the factory. We gapped them a bit narrower due to the anticipated boost the 61mm pulley would provide.
Found this link today... I know my car is running a fair bit of timing with this latest tune. Still need to check tightness of plugs, haven't had time to rip everything apart for the 4th time this week
I Have Slightly Modified My Motor - Do I Need a Colder Spark Plug?