Inside A Ram Air V - Pontiac Tech
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An obvious difference between a Ram Air V 400 Pontiac block and any other four-bolt block of the era is the ribbing in the lifter bore area. They stabilize the block in two ways: First, the lifter bores are reinforced for use with radical cams, and the other is that the block is more resistant to the stresses that can split it lengthwise down the middle. View Related Article
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