TDC compression is with both valves closed.I’m pretty sure I was on tdc compression because the exhaust and intake rockers were both up. My understanding is they’ll be down on tdc exhaust.
TDC exhaust is with both valves open VERY SLIGHTLY on overlap. The rocker arms are going to look the same as with TDC compression--because the valves are so slightly open they'll look closed; and IF (big IF) there's much lifter bleed-down, the valves may actually be closed on overlap.
Hard to say if that's 180-off, or just mis-timed.I started it up and this time I got fire.
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