Being Alumium heads do you all think you should start with a standard heat of go colder? I was told to run a 5/8 version of the RN12YC but I want Iridum so I went for Denso IQ16TT's that are in the heat range of 12. They have a colder IQ20TT too that is a 9 to10 heat range

spark-plug-heat-range-chart.jpg

Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015


Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.

03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)