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What makes a vv61 better than a D is the difference between seat timing & .050" timing often described as 'hydaulic intensity' for hydraulic cams. Comparing cams by using duration measuments at different lifts is only accurate when both cams being compared have the same lash requirement, otherwise it's just an educated guess.
Something else to keep in mind is cams make a lot less difference to power & toque than heads. An engine equiped with a D cam & a good head is always better than an engine equiped any other cam & a standard head.
Cheers,
Paul.
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