Originally Posted By BradH
An NGK "5" would scare me. I'm not sure I'd use anything hotter than a "7" even for a regular street car, but a lot of that is based on my experience with too-hot heat ranges used in motorcycles.


Went 9.79 @ 135+ several years ago first pass ever w/the new combo and a # 7 and my carb was lean as in the 14's up top and saw a tiny bit of peppering so now I run 8's at 12.1.1 comp......... thumbs

Last edited by Thumperdart; 09/18/17 04:27 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....