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For stock valve springs, the K is the best of the three & if you drive it sensible will give more fuel economy than the A grind. It's also very worth while to degree the cam in using a degree wheel & dial indicator. That website that had a table of figures on it is mostly garbage too. You can't compare anything until you've had them in your hands & measured them with a degree wheel & dial indicator. KD, KN or BBB needles are the ones you need for your SU's depending on which SU's you have.
Now if you have the funds, get a good set of dual or beehive springs fitted to your head & get a D cam from Phil S.
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Three 164's, Two 144's, One 142 & a partridge in a pear tree.
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