the problem with the early 4.6L engines was that the oil pump relief valve bore was just the aluminum front cover and when too thick oil was used the valve would slam back and wear the bore , then the relief valve would stick and oil pressure would exceed 100 psi , making even Motorcraft filters swell . Ford started putting a hardened sleeve in the relief bore and the problem was for the most part history. I remember seeing that issue a few times.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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