16-03-2019, 02:20 PM
(This post was last modified: 16-03-2019, 02:22 PM by Reckless Rat.)
Earlier blocks have screw in core plugs. There is usually an engine number stamped inside the valve chest at the lower front end and often on the flywheel too. The A F numbers are casting numbers. Presumably the last one you quotes is also a date in reverse. 1A is a part number.