Thread: How many people are successfully running 10-1+ compression Iron Head 400's on Pump
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Old 09-02-2019, 12:57 AM
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TransAm 474 TransAm 474 is offline
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Join Date: Jun 2004
Location: Cape Fair,Mo
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What AC Spark Plug should we run in this? Just want to make sure we get the heat range correct. Just as a reminder, these are 12 heads, big plug......

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1978 Trans Am
Pump Gas 461 Stroker
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