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Spark Plug heat range

Old Oct 19, 2025 | 08:48 PM
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Eightyninef's Avatar
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Spark Plug heat range

LB9. Removed AIR. Car runs amazing. also new injectors, cat back, etc.
Original plugs were R43TS. .035 gap.
Now I want to start reading plugs for proper heat range. I'm sure it runs a little bit lean with the cat back.

Anyone read plugs and make adjustments??

I also noticed the L98 is .45 gap. Can't figure out why such a difference for 45 more cubes.
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