I would use an AC R44S or R45S. That is a more modern plug replacement for the original 45. The extended tip works great in O-head valve engines. It resists fouling & runs cooler. The resister reduces radio interference if you have a radio & other comunications that you are driving close to.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum