I'm just curious about what spark plugs some of you guys are using. I have a 347 with Victor Jr. heads. I run high 10's going threw the traps at 7100rpm. I occasionally have the problem of burning the tip of a plug. I was told it was because they were cheap passenger car plugs that should not be in a race engine (Champions). What plugs and heat ranges are you guys racing with a 347 with Victor Jr. heads using?