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These are used on the exhaust ports and fit between the exhaust manifold and engine block recessed areas to form a tight seal and prevent leaks. Ford discontinued use of these for a brief period in early 1929.
If the manifold or block has been resurfaced, the width of the gland rings will need to be reduced by the same amount.
CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov