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· Old Opeler
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Nobody and I looked at this extensively some time ago and discovered that if the block number has a * mark at both ends of the serial number it was originally equipped with flat top pistons. With a * mark at one end only ( usually the arse end) the block had been originally fitted with lo-comp pistons.
This was true of 19S numbers but no one ever came up with any 19US block numbers. GS20; Do you have any 19US block numbers that can be positively identified with a particular year of GT? And of known piston type?
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