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#1
05-17-2024, 02:13 PM
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Spark plug recommendation
What spark plug would I use in a set of 6X-4 heads that are on a 455? Compression is probably around 9.5:1. It has headers, a/c, automatic trans and the cam is the Butler 068 roller equivalent.
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#2
05-17-2024, 02:34 PM
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I just put a set of Autolite 85’s in a 10.00.1 400 with 16 heads . One step hotter than the R43 delcos it had . They are Chicom but what isn’t ?
__________________
 When I wore a younger man's clothes
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#3
05-17-2024, 03:08 PM
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The original plug for a 73 SD 455 was a 44ts , so I would go with the R version of this number.
__________________
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