I was a Champion user but switched to NGK's about 4 or 5 years ago and am very happy with them, one is 340 w/ironheads and the other is 416 w/eddy heads
Gary
What number NGK's do you run and is it up or down from the normal heat range.
1969 340 4 Speed Swinger R4, black vinyl, white butt stripe, 3:91
