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Does anyone know what the difference is between the Saginaw power steering gear boxes tagged SPA AE that were used starting 1/2/73 and those used earlier tagged SPA S or U?

I recently initiated a thread regarding Ignition Timing Settings and received a number of great posts in reply. Today I took a close look at the markings on the heads of my 1971 M code engine and find that apparently one is an open chamber 4V head and the other is a closed chamber 4V head. This...

I have reviewed all of the threads I could find on this website and others on what ignition timing settings should be for the M code 351C in my Mustang and conclude that the best recommendation is for around 10º-18º initial advance and a maximum initial plus centrifugal advance of 32º-38º all in...