Small brass tapered plug fits 1/4" hole for the oil release passage PRE 1985 on Metro blocks which most engine tuners replace to clean out any sludge - 6.95mm tapering down to 6.25mm - also used as a general engine plug but mostly as a cylinder head plug. Later engines used 12G3503 for head face and MPI a metal rivet in place of this brass plug.
Small brass tapered plug fits 1/4" hole for the oil release passage PRE 1985 on Metro blocks which most engine tuners replace to clean out any sludge - 6.95mm tapering down to 6.25mm - also used as a general engine plug but mostly as a cylinder head plug. Later engines used 12G3503 for head face and MPI a metal rivet in place of this brass plug.
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