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Old 02-01-2011, 05:32 PM
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Spark plug selection SBC Phase 2 Bowtie HD

Need some advice on a good plug to use on the Phase 2 Bowtie GM heads. I am using Autolite 26 now, but they seem to be running cooler than I would prefer. GM reccomends a 3/8 reach, but all I can find are .441 reach, close enough?

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Old 02-01-2011, 06:04 PM
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3/8 is .375, pretty close. If you think you're too cold, change heat ranges.

Here's some tech info:
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Old 02-02-2011, 06:34 AM
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A autolite #26 is plenty hot. equal to a delco R45TS
Its considered a "stock" plug. it is not a cold plug.
If you are having issues, look at the idle AFR (carb) and idle timing.
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