Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 351w valve train
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Old 02-21-2013, 04:30 PM
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Stock 351W engines came with self-aligning rockers or with non-self aligning rockers. The long tip valves were only used with the self-aligning rockers for additional clearance of the keepers, not the retainers. The outer edge of the retainers are low enough to clear the self-aligning rocker arms, but the rails (nubs) on the self-aligning rocker arms will hit the keepers if the short tip valves are used.

Stock 351C engines only have non-self-aligning rockers with short tip valves.
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