[Jeff Alton]

What are the unnecessay challenges that should be avoided? What CR and cylinder bore can one get away with while not twin plugging? Or, what would you say the safe thresh hold is for not twin plugging when running pump gas?

Is there a rule of thumb for cam/cr/bore that can be applied to avoid the cost of going twin plug?

I always assumed (and quite probably incorrectly) that if the bore was 95 or above, one would be "pushing it" with a higher than 10.3 "euro" CR. (on pump gas) And even that may be pushing it. I realize running a bigger cam can help get away from detonation issues, but how big?

Anyone out there know of PROVEN high performance combos that work with out twin plugging that are not "mild" motors?

I know, a bit of topic of the thread, but it would still be good info to have.

Cheers