I just put a piece of solder down and turned the crank by hand and want to know where to measure the squish from? All the way at the end where it was touching the cylinder wall or back off a tad and measure. any one?
Compression Ratio = 311.6/25 = 12.4:1 Which is very high in this case, but we assumed values.
Now in your case, with an altered (thinner) base gasket, the piston travels further into the combustion chamber, reducing the volume of the combustion chamber. If you can figure out how much further, you can conclude how much you've reduced the volume, and you're good to go...
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