Page "hobbies" Paragraph 256
from
Brown Corpus
The volume of the cylinder opening in the head gasket must be computed by multiplying its area in square inches by the gasket's thickness in thousandths of an inch.
Sometimes it is necessary to roughly calculate the square inch area of the opening but the calculation can usually be made with sufficient accuracy that it won't affect the final computation.
The volume of the opening is added to the combustion chamber volume.
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