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Whether you choose to start with a 318 or a 360 as seen in this picture, you can see why it is so easy to drop in a 4-inch-stroke crank. There is a ton of room in the crankcase to fit that big arm. A 318 stroker built out of a block bored out to 4 inches equals 402 cid (6.6 liters), by the way. A 0.030-over 360 stroker adds up to 408 cid.