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Discussion Starter #1
I'm running a 351W in my '67, I have compression that is just over 11 to 1. I would like to run a colder plug...

Anyone know what the part numbers would be for Autolites if the stock plug is APP25 ???

Would like to drop several degrees since the plugs I took out (another brand) were 2 degrees cooler and I'm still fighting pinging.

BTW plugs I took out are AC R43TS6
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