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More for Less Racer
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21,124 Posts
The catagory is for things like a dish faced valve, the spark plug volume, ringland crevice.

It is a recent adition to the Wallace calculator, showed up just in the last couple of months. I typically add nothing, as the amounts for the things i just mentioned are just really small in something 300 cubic inch or bigger, with dish faced valves being about the only thing that would have much impact on a domestic V8 calculation....but could be a big issue on something small like a 150 cubic inch
 
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