In terms of the effect per degree of change, LSA is more important than any other number. IMHO 112 is too wide, those heads need more overlap triangle.
Hmm...so this is an interesting comment, here is why.
The tighter LSA exposes the INTAKE and EXHAUST events to each other, in general, that normally translates to the ability to do wave tuning, since exhaust pulses may be used to pull in additional intake charge possibly resulting in >100% VE.
Now, as the heads start to flow better, and I think all will agree that W2 is that type of a casting, it generaly becomes less important to rely on such wave tuning. Basicaly, as the intake port performs better it needs less and less help from the exhaust side to feed the cylinder.
So this is why I'm surprised by your statement that these heads need more, to me it actually feels like quite the opposite.
