Three 0.50 inch diameter pipes will fit into one 1.50 inch diameter pipe (hypothetically). The 0.50 inch diameters stack on top of each other until you have 1.50 inches!
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250 cubic inch - straight 6 cylinder - ( .050 inch ) 302 cubic inch - V8 - ( .050 inch / .060 inch in California )
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1/20 of an inch.
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.050 inch.