| 1500/1600 are small valve small combustion chamber heads.  1622/1800  are 
larger valve and chamber. They can be used on the smaller displacement  engines 
but require higher compression pistons or you'll end up with very low  
compression.
 
Bill
 
In a message dated 28/02/2008 5:41:45 P.M. Pacific Standard Time,  
james.f.juhas@snet.net writes:
I  understand that the heads used on MGA 1500 and 1600 engines are  the
same.  Is there a difference in the head used on a 1959  Magnette?  Also,
can an MGB head be used on a 1500 or 1600 engine as a  bolt-on option?
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