What is a gasket ‘conversion’ set.

[marina12]

Always wondered from my Marina days when you bought a gasket set and it said it was a ‘Conversion’ set what was it converting? Thanks. Never understood- sample on eBay now for reference:
https://www.ebay.co.uk/itm/MORRIS-MARIN ... Sw5h5Zbz6e

[david painter]

Bottom end and timing cover gaskets were always known as conversion set ie all the gaskets required to remove and install crankshaft as opposed to just the sump gasket
Dave

[marina12]

Thanks and that’s interesting. I had several sets just to get a couple of the gaskets I wanted; had loads of unused odd bits which are long gone!