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911 Cylinder Identification

Engine

Vehicle Information: Model: 911 SC; Year: 1979; Body Type: Coupe; Total Mileage: 88798;

I have removed the cylinders from my 79 911 SC. The cylinders are Alusil type. At the base of the cylinders there are markings suchas the following:885/1A+885/2A+885/1B+885/2B+These markings indicate the size group and the height group. Which markings indicate what?I plan to have the cylinders coated so I can use J&E pistons in them. Can the cylinders be bored to 98mm or will that make the cylinder walls too thin?

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