Topic: CB750 - indentifying cylinder assembly version?

[flybackwards]

Let me ask this another way - there are several version numbers on the block assemblies all based on 12100-300-  there's at least 020 030 040 050 and 060 versions - I need to replace an 060 on my K7 - is there any casting numer or other id?  Or what are the key visual differences? Is there a reference somewhere?

[754]

 Early ones have different shaped holes in the bottom for oil drain?
But I think 69 to 77 K should all interchange,  the ones that won't work are F model versions.

[754]

 I forgot there is differences in the oil hold rubbers , some have bigger holes with the rubber over a dowel.
 I think 73 or 74 should all fit to the end .. so get that  same style to match your head.