Here’s a David Vizard method of selecting LSA: Engine C.I./8/Intake valve diameter = X
Example:
318/8 = 39.75
39.75/1.92 = 20.70
20.70 on the graph shows: 109 LSA
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Change around with cubic inches and intake valve diameters can you can see the various LSA’s It comes up with. Obviously there’s more to it, but if you read some of his books and his theories on camshaft selection it all makes sense