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“Do I need to add a lead substitute to my gas?”
No. Lead substitutes are nothing but octane boosters, and with the 6.5 to 1 compression on the 8N, you certainly don’t need high octane. The 8N valve seats are hardened inserts and will not be harmed by unleaded fuel at all.
Thanks to John Smith of Old Ford Tractor for allowing us to use this information.