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408 Cubic Inches With A 350 Block

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On the left is a conventional spring and retainer. On the right is the spring and retainer used by AFR. The combination of valve, spring, and retainer cuts mass at the valve by 16 percent.
408 Cubic Inches With A 350 Block - Stretching The Limits

 On the left is a conventional spring and retainer. On the right is the spring and retainer used by AFR. The combination of valve, spring, and retainer cuts mass at the valve by 16 percent.  View Related Article

 

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