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deuce_roadster · 11-30-2012, 11:15 AM

I think lead additives didn't come in until the 50s when higher performance engines were being built, So most of the flatheads were pre lead motors. I don't believe a stock engine would need the lead, especially with those stock valve springs.
My built motor in my roadster has hardened seats but I am running springs that have 200 lbs pressure over the nose of the cam. I run premium gas (which has less octane then "regular" used to) but don't need a lead additive to keep from pinging.

11-30-2012, 11:15 AM	#5
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,804	Re: lead substitute in gas I think lead additives didn't come in until the 50s when higher performance engines were being built, So most of the flatheads were pre lead motors. I don't believe a stock engine would need the lead, especially with those stock valve springs. My built motor in my roadster has hardened seats but I am running springs that have 200 lbs pressure over the nose of the cam. I run premium gas (which has less octane then "regular" used to) but don't need a lead additive to keep from pinging.