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Originally Posted by Thor
Just to confirm, the 407s to 410s all had the early engine. When launched it was called the 'A' series engine, but when the later 318 was introduced that was also called 'A', so somewhat confusing. The general term for these engines is 'Polysphere' or even just 'Poly'.
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Just to clarify, the later 318 was officially called an 'LA' series engine, but for some strange reason no one ever mentions the 'L'. This 318 engine was first made in 1967. It was used by Bristol in the 603E. The 360 engine used in the 603S and later Bristol models was also an LA engine.
As stated by Thor, the earlier 'A' series engines were know as 'polysphere' engines, this was because they have polyspherical combustion chambers. If you use the term 313 or 318 'Poly' when talking about engines in the Bristol 407-410, everyone in the Mopar world will know what you are talking about. Unfortunately, any reference to the 'A' engine will be taken to mean the LA engine.
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I'm not so sure about this next comment but I think some 407s and possibly 408s had 313 cu.in. engines, earlier types than the 318. They look the same but have slightly smaller bore (?).
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Correct. The 313 poly was used in the 407 and 408 up to chassis 7200.
The lighter transmission and 318 (poly) engine were fitted to the 408 Mk2 from or after chassis 7200.
Hopefully I haven't just added to the confusion!