The #6 is the heat range and the 11 is the gap. #5 would be one step hotter


1967 Dart GTS 426 Gen III Hemi
1968 Hemi Cuda 572 SS/AH Clone
1988 Chrysler LeBaron Coupe S/S
2003 Dodge Ram 1500 4dr SLT lowered
2012 Ram 1500 2wd Lowered
1970-1/2 Camaro Z-28
1974 VW Karman-Ghia