I have gone through Clausager myself and like you can't find any reference
to 658M either. I do have two SU carbs, but I haven't checked them to find
a model number (where would I look?) and I do have the proper emission
controls for my build date which really makes me wonder about the M. Could
it be a factory reconditioned engine. If I recall correctly reconditioned
engines had a different type of engine number signifying them as being
factory reconditioned.
Mark
> -----Original Message-----
> From: Paul Hunt [SMTP:paul.hunt1@virgin.net]
> Sent: Wednesday, February 17, 1999 3:28 PM
> To: Jones, Mark; mgs@autox.team.net
> Subject: Re: MGB Engine Numbers
>
> Clausager has a comprehensive listing of engine numbers over the years and
> your prefix doesn't figure, they jump from 585-Z-L to 672-Z-L (Aug 71 -
> Aug
> 72, Aug 72 - Sep 74, Z meaning two carbs and emissions control, NA only,
> 'L'
> for low compression. If it is engine from another application it is
> curious
> that it seems to be the correct age. Maybe Clausager missed something.
> Incidentally, 'M' doesn't figure in any number for any year.
>
> PaulH.
>
> -----Original Message-----
> From: Jones, Mark <MJones@ngl.ca>
> To: 'mgs@autox.team.net' <mgs@autox.team.net>
> Date: 15 February 1999 13:56
> Subject: Re: MGB Engine Numbers
>
>
> >Okay with all this talk about engine numbers I have got to ask about
> mine:
> >18V658M-L17025. The engine is in a 1973 GT build date: 02-73. What I
> can't
> >figure out is what does 658M stand for. Any help would be appreciated.
> >
> >Mark
> >
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