Determining Series Compression Ratio

phalford said:

I have just bought a LR that seems to be a bit of a hybrid of Series 2a and 3.
The engine number is 902xxxxxx indicating a Series3 petrol 2286cc - 8:1 CR 3-bearing.
However the Cylinder head has a part number on it of 525183 indicating that it is a 1962 to 1967 - 7:1 CR
Am I missing something or have I got an old Series 2 head on a Series 3 block?
It would be useful to know the CR for sourcing parts (spark plugs etc.) . . . Any help appreciated . . .

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wammers said:

Compression ratio is usually changed by pistons not the head.

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phalford said:

I have just bought a LR that seems to be a bit of a hybrid of Series 2a and 3.
The engine number is 902xxxxxx indicating a Series3 petrol 2286cc - 8:1 CR 3-bearing.
However the Cylinder head has a part number on it of 525183 indicating that it is a 1962 to 1967 - 7:1 CR
Am I missing something or have I got an old Series 2 head on a Series 3 block?
It would be useful to know the CR for sourcing parts (spark plugs etc.) . . . Any help appreciated . . .

Click to expand...

jamesmartin said:

heads on the 4 cylinder petrols

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