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We Build a Tri-Power 427 for Today’s Driver
Chevy made big-block crankshafts in two different strokes. The 396, 402, and the 427 all use a stroke of 3.76 inches. These are internally balanced crankshafts. The 454 uses a 4-inch stroke and is externally balanced. All the main-bearing journal diameters for the Mark IV big-blocks are 2.7482 to 2.7492 inches, with the rear main-journal diameter at 2.7478 to 2.7488 inches. The rod bearing’s journal diameters measure 2.1988 to 2.1998 inches, making the crankshafts interchangeable. We’ll be using a crankshaft with a stroke of 3.76 inches to make our engine a 427 just like the original. There are two different types of big-block crankshafts—cast or forged. You can tell the difference by the parting line on the crankshaft throws. The cast crankshafts will have a thin parting line where the two halves were joined to make the complete crankshaft, while the forged crankshaft will have a wider parting line. The 427 Corvette crankshafts are all forged steel. View Related Article
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Chevrolet Corvette Research
Chevrolet Corvette Car and Truck pricing can be complicated and sometimes confusing. As an authority on car buying needs we provide information about new cars, such as the Chevrolet Corvette and all the features it comes with. Fuel efficiency is important and the 2010 Corvette with a 18.0 gallon main premium unleaded fuel tank 15.0 capacity gets 19 mpg, and has a comparable trade in value which should come in handy when you go to shop for your next car. Also check out the Chevy Tahoe.
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