I've only worked with 1275's but...
I think the stock 948cc motor had either 26 or 28cc combustion chamber vol (the 
different cc capacities for the three is in Vizard's) so in either case, it's 
seems the head has been VERY much cut...as in high
comp. racing type application depending upon bore/piston chosen in the block 
matching this particular head.
Figures for the height of each head
as it came stock from the factory is also in Vizard's I believe.
CapBob
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