What Makes a 383 Stroker?

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    Bore and Stroke Calculations

    • Displacement is calculated by using the formula:

      Bore times two multiplied by the stroke multiplied by the number of cylinders multiplied by 0.7854.

      To achieve the Chevy 383 displacement, you would use a bore of 4.03 inches and a stroke of 3.75 to yield 382.67 cubic inches, rounded to 383.

    350 Engine Block

    • When the 383-stroker combination was first developed, the 350 block was used. The 350 engine had a standard bore of 4 inches. The bores of these blocks were machined to increase the diameter to 4.03 inches.

    400 Crankshaft

    • The 400 CID engine crankshaft--with its 3.75-inch stroke--was initially used in this combination. However, the 400 engine used larger main bearing journals on the crank, so it needed to be machined to the smaller 350 block's dimension. As of 2010, there are many aftermarket manufacturers that provide new 3.75-inch "stroker" cranks (and complete kits) specifically for this combination.


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