16V head-combustion chamber volume?

[drew at scirocco.cs.uoguelph.ca (Drew MacPherson)]

I understand that the 16V head has a greater combustion chamber volume in 
the cylinder head than the 8V engine (right?) which results in 
undesireable compression ratios when mixing and macthing 8V and 16V 
heads/blocks (ie. 8V head on 16V bottom end = high CR & detonation, 16V 
head on 8V block = undriveably low CR)

Does anyone know how much of the chamber volume is in the head on the 16V?  
How close to the deck do 16V pistons come at TDC?

Drew

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