Exactly. He is trying to get the most out of the fifth cycle of engine performance (exhaust purge). Using his numbers, the aluminium head should have a 112* a modified log with larger valves should see 110, but flow restrictions in the head could make that a bit tighter whereas a stock log should see 108* or tighter . But at the same time that should change the duration in relation to the lsa. And even then, flow characteristics have to be added into account. A more restrictive engine can handle more duration to a point and less for something like the aluminium head.
I.e. where I've made my mistake, I used that chart and calculations, but feel that since the head flows so well , I should really step down my cam a level to obtain low end that went to poo on me. And have an idle that doesn't scare me out of traffic sometimes. If I was always running maxed out, it would be perfect, but that's simply not the case for most of us.
I.e. where I've made my mistake, I used that chart and calculations, but feel that since the head flows so well , I should really step down my cam a level to obtain low end that went to poo on me. And have an idle that doesn't scare me out of traffic sometimes. If I was always running maxed out, it would be perfect, but that's simply not the case for most of us.
