Does this prove David Vizard's 128 lsa formula ?

1MeanA said

I guess my stock 340 build is going to suck with my '68 4 speed cam (114 LSA installed at 112)

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It will be fine. How many thousands of 340's left the factory with that cam? Back then they made cams that were low lift and big duration and LSA. Those cams were easy on valve train and didn't need any tricks for big lift and clearances.