In your first post you asked about decent prices for the spark plugs. Depending where you buy them from they can be very expensive. One of the modern replacement numbers for the old plugs is Autolite 2243 for the old AR5S, and 2245 for the old AR7S. Rock auto lists both the 2243 and the 2245 for $6.63 each. That compares very favorably with the $15 plus that many dealers list them at.
The 2243 is the colder plug, the 2245 is hot. Engine condition along with type of usage would dictate which plug to use.
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24-09-11, 13:22
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