I am planning to do a compression test on my 83 GT and in the process change plugs. I currently have Motorcraft ASF 42C. Looking at my previous plug change 10 years ago, I had ASF 52C plugs in. I know they are a slightly hotter plug. Is there an advantage to going back to that plug? Its a stock motor with headers and Edelbrock 1406 carb. I checked one current plug (ASF42C) and it was slightly black. Looking at my old plugs (ASF 52C) were nice and brown. I know this could be a tuning issue, but was wondering if a hotter plug would be better. What are the disadvantages of going to a hotter plug?
Thanks
83-Steaman
Connect With Us