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3.5 if memory serves. The 400 has the shortest stroke of all sbc. With a crank change I think you can use 350 rods but verify-it's been a while. Get a catalog from P.A.W. in Ca. They have more engine stuff than anyone else & tons of kits.

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14y ago
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Q: How long are the rods in a 400 Sbc?
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