D Dacon Active Member Nov 6, 2005 103 21 28 Dec 27, 2014 #1 Dec 27, 2014 #1 Our cars run a UR45 NGk spark plug stock. 2 steps colder from stock = UR6 correct? The tr6 from NGK is a different plug and won't work well with the 302?
Our cars run a UR45 NGk spark plug stock. 2 steps colder from stock = UR6 correct? The tr6 from NGK is a different plug and won't work well with the 302?
coupestang2 Active Member Sep 11, 2014 108 132 53 Cornelius NC Dec 28, 2014 #2 Dec 28, 2014 #2 Autolite 3924's .....my opinion, is the best plugs
D Dacon Active Member Nov 6, 2005 103 21 28 Dec 28, 2014 #3 Dec 28, 2014 #3 Those are for aluminum heads though, autolite on the stock iron head is a Autolite 25, 2 steps colder is an autolite 23 but I have been told (and seen) that NGK's have a more recessed tip than autolites and which makes better for turbo applications.
Those are for aluminum heads though, autolite on the stock iron head is a Autolite 25, 2 steps colder is an autolite 23 but I have been told (and seen) that NGK's have a more recessed tip than autolites and which makes better for turbo applications.