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By Kai - 8 Years Ago
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Need to change the plugs and wonder which of the following spark plugs I should use:
Autolite 46
Autolite AP46
Champion 11 / RF18YC
AC Delco R85TS
0r ?
Kai
Hanau/Germany
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By 57RancheroJim - 8 Years Ago
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I've been using Autolite 45's for years..
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By Kai - 8 Years Ago
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Are you sure about the 45s ? Everywhere that I checked they say 46s.
Kai
Hanau/Germany
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By charliemccraney - 8 Years Ago
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46or equivalent for a stock engine. 45s tend to be best for modified engines
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By 57RancheroJim - 8 Years Ago
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My engines see lots of hiway mileage so I prefer the cooler plug, I don't think the difference between the two is that great? I use them in my 223 I6 and a stock 390FE also and have never had a problem.
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