I would double check your understanding including looking at the respective 
cranks.  The Metro is a transverse block.
The arguments for and against an A+ block versus other block are finely 
balanced.  I doubt very much if the block will be weakest item or the one 
most likely to fail/blow.
Daniel
In a message dated 20/07/00 20:49:59 GMT Daylight Time, 
tstone@frontierprecision.com writes:
<< Otherwise the block is exactly the same from
 what I understand.  The reason Jon (supplier) wanted me to use an A+ was for
 the extra webbing on the sides.  I want to make the strongest engine I can
 so I don't blow it up. >>
 
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