Does this prove David Vizard's 128 lsa formula ?

Ant said

Ah, I see now. Thank you.

I did some math for a low compression 8.6: 1 or so 318 with stock 1.78in valves and would need an LSA of 105 degrees. I'm assuming this is for a ballpark max performance cam and not a normal street use engine that needs high vacuum, or at least for some cases.

Click to expand...

No that would be his recommended lsa, for street and or race.

Say you like comps xe256h cam on 110 for your engine, to DV that choice basically you'd keep the same basic overlap and cut the cam on 105 lsa with that overlap and that would give you your new duration, probably something like a 250 cam on 105 lsa if you could find such a thing.

Basically find a small RV cams cut on 107-110 lsa and you'll be close to DV recommendation.