best spark plugs for gt40 heads?

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10-03-2009, 08:09 PM

9165pt0

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best spark plugs for gt40 heads?

hey guys what kinda spark plugs should i get, i have gt40 iron heads. i was running autolite 3924s. but i read some stuff on gt40 heads should use autolite 105s?

also if the spark plug tip is chalk white, it means its running lean right?

10-03-2009, 08:39 PM

badass84gt

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Location: Lewistown, Pa

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Yes its running real lean. I run NGK TR55s in my P heads and they seen to work very well.

10-03-2009, 10:45 PM

AdderMk2

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autolite 764 or 104

10-03-2009, 11:02 PM

9165pt0

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ok thanks. what should i look at for it running lean? it still has stock fuel pressure regulator, so idk whats going on...could it be something else

10-03-2009, 11:40 PM

AdderMk2

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cean the maf and change the O2 sensors

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