Dennis,
The earliest PB's had PA engines bored to 60 mm. Later PB's had a double
breather block and a little more metal in the 'body'. I don't know at which
engine number they switched but I bet somebody does.
You can get pistons for any size bore you want, but your question is not
clear. Which block are you going to bore 20 thou' over? If its an original
PA that's already 60 over, I'd be very careful, its probably at its limit
now. If its a later PB then that would be OK.
Cheers, "Bob".
> From: DENKLEMM@aol.com
> Reply-To: DENKLEMM@aol.com
> Date: Thu, 14 Nov 2002 12:05:11 EST
> To: mg-mmm@autox.team.net
> Cc: jj@octagon.fsbusiness.co.uk
> Subject: MG PA pistons
>
> Hi All
> Just heard from the machine shop again....different tune. The pistons that
> are currently in the engine measure 2.359", slightly under 60 mm. Does this
> mean that these are PB pistons? What is the difference between the PA & PB
> blocks? Can I safely bore out to 20 over? Are 20 over pistons available?
> Thanks,
> Dennis
> PA1518
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