> Huh?  If the cylinders are smaller then the engine is usually smaller too. 
> The amount of metal in the engine only needs to be strong enough to stop 
> it falling apart.  Bigger cylinders usually means higher internal forces, 
> so you then need *thicker* metal around the cylinders, not thinner!  When 
> you look at the specs of cars, the ones with bigger engine sizes are 
> heavier...

The blocks used to be standard, designed with a bit of a margin
even for the largest stock piston designed for the block. You could
bore out the pistons larger with a small risk of the block cracking later
and put in even bigger non-stock pistons. I'm not sure what the
current cost of iron is but at one time it was about $25 a ton.

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