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The ones on the first pic. look to be aluminium and the earlier cast iron. Or just an artefact of the image ???Dunno about you, too damned hot here. … Well, shove a couple of cans down my neck and doze off in front of the telly
Perfect throttle response ?
Just seen your reply Dave - as you can see this did happen to parts made before but I grant you the liners were thin - just 1mm thick if I remember. I have a feeling but may be completely wrong as have no experience of it that possibly full size the bores would be machined after the shrinking - as per the Eta perhaps?