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35fordtn · 08-14-2018, 03:21 PM

Jim, If I am seeing it properly, your graph depicts the 68 beginning its advance curve right off of 500 rpms. Do you tamper with the springs at all? In stock form a 11A seems to advance at or just above the 500 rpm range, but the 68's much later.. Thats the main reason I prefer a 11A over a 68.. when stating rpms I am referring to crank rpms not distributor rpms..

08-14-2018, 03:21 PM	#24
35fordtn Senior Member Join Date: Aug 2010 Location: McMinnville, TN Posts: 2,327	Re: Need some distributor lessons Jim, If I am seeing it properly, your graph depicts the 68 beginning its advance curve right off of 500 rpms. Do you tamper with the springs at all? In stock form a 11A seems to advance at or just above the 500 rpm range, but the 68's much later.. Thats the main reason I prefer a 11A over a 68.. when stating rpms I am referring to crank rpms not distributor rpms..