Colder spark plugs
#1
Colder spark plugs
Im looking to try one heat range cooler on my spark plugs due to getting some detonation. I currently run auto lite 85s and i was wonderig what the next cooler plug would be. Ive done some looking online but its not easy to find a chart showing the heat range of the different spark plug part numbers. Btw, i have an olds 403 with about 10:1 compression. I run premium gas and have backed the timing off 5 degrees from the spec (which i was told is 20 degrees) and i still get some pinging on hot days. Thanks
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bob p
Big Blocks
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April 10th, 2015 01:55 PM