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Old 10-12-2012, 09:02 PM   #16
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,275
All the BMW's heads/pistons have a squish band. The earlier ones are square with the bore and the later ones are angled. The squish band is the flat or angled area of the head before it dips deeper into the more hemispherical portion of the compustion chamber. It will all become clear when you put one of your heads on both size cylinders and look at the combustion chamber through the bottom of the cylinder. A piston's view of the situation so to speak.
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