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My guess is that these particular cases were subjected to dimension checking. This happened regularly at a certain frequency, maybe one in 50 produced samples. The Plumstead works had a special inspection department which monitored production of each part continuously. Upon approval the component(s) were stamped. The more machining operations a part needed, the more frequent the inspections became. This has to do with cost of scrapping rejected parts of course. Thus it is no wonder that cylinder heads, engine cases and crankshafts had a tight inspection regime.It is possible that the inspection regime was tightened after design changes until fabrication parameters had stabilised. Such changes occured in 1966 and 1967 affecting oilways, oil pump, cylinder barrell, cylinder head, ignition system (points housing), to name a few. There were probably many minor alterations to the engines which are unknown to us today.-Knut
My guess is that these particular cases were subjected to dimension checking. This happened regularly at a certain frequency, maybe one in 50 produced samples. The Plumstead works had a special inspection department which monitored production of each part continuously. Upon approval the component(s) were stamped. The more machining operations a part needed, the more frequent the inspections became. This has to do with cost of scrapping rejected parts of course. Thus it is no wonder that cylinder heads, engine cases and crankshafts had a tight inspection regime.
It is possible that the inspection regime was tightened after design changes until fabrication parameters had stabilised. Such changes occured in 1966 and 1967 affecting oilways, oil pump, cylinder barrell, cylinder head, ignition system (points housing), to name a few. There were probably many minor alterations to the engines which are unknown to us today.
-Knut
