if i don't have my numbers mixed up on champion plugs the higher the number the hotter most people have misconceptions on heat ranges,some are scared of hotter heat ranges fearing engine damage,if your was running ok with the 21 range then switch back,a plug chart showing what effect heat ranges have on a plug would make it easier to understand, the whole purpose is to get the range that's cold enough that it won't damage the plug from high operating temperatures in the cylinders under heavy load and high rpm, on the other end of the spectrum is one hot enough to prevent carbon fouling from low cylinder temperatures ,low rpms ,slight oil usage, ect.and but not hot enough to damage the plugs cause denotation and a few other problems,use to work for an outfit that their mechanics at the garage would tune up a truck with a 427 engine using 10 range plugs, which was fine on a good engine being run on the road at high speed ,but shortly after arriving on the job site they would start killing spark plugs due to low rpm operation, less engine loading and long idles i have used as high as a 17 heat range to prevent fouling. would solve the problems until they went back to the shop and got tuned up again because the manual recommended 10's and that's all they would use
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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