Actually, you were correct with your first comment. Given so much clearance due to piston height, dome/dish, reliefs, head milling, valve angle, and valve size leaves one other major factor - The valve events.

Think about where the piston is when the valve is reaching max lift. The intake valve hits peak lift when the piston is headed down the bore. The exhaust valve reaches max lift while the piston is coming up, but it is way down in the bore................... so, what does that leave us with? When the valves are opening and shutting... Valve events...... Duration, LSA, ICL

 

English please?? LOL j/k just have to read 2-3 times.

 

Let me see if I can explain it like this.
We'll only look at the intake valve relative to the piston.

cam: 220* of duration @ .050'', 112 LSA, 0* of advance
VE's: -2* ATDC, 42* ABDC
VE's: IVO/IVC - Intake Valve opens, closes

With 220* of duration and a 112* LSA, with 0* of advance the intake valve will open 2* after the piston has reached top dead center (TDC) and the intake valve will close 42* after the piston has reached bottom dead center.

The piston came up, pushed all of the exhaust out and 2* after it started heading back down the intake valve opened. The piston went all the way back down and 42* after it reached the bottom, it closed.(the beginning of dynamic compression.... )

Time out. Read it again. All of it.

Okay. What do we have? The valve opened 2* after the piston reached the top. The piston then went all the way down and became coming back up. All of this time by the way, you are bringing in the intake charge. 42* after the piston reaches the bottom, the valve closes.

This means that somewhere inbetween all of this, peak lift was met. It happened at the very middle if it's a symetrical lobe (equal up the lobe and down). The valve has opened near the top and closed after the piston started coming up. The middle of all that is somewhere while the piston has started traveling down the bore.... Pretty far down the bore I might add.

If this cam has .550'' of lift or 600'' of lift, it's probably not going to matter because the piston is so far down the bore. What is going to matter tho is the valve events.

 

h/o still timing out to read agian and agian and agian and agian and aigan. haha j/k.

THanks sport side that helped understand a little more.

 

that lsk 223 .636 112 is the exact cam richard sold me on for my l92/l76 setup. sorry guys not in yet.

 

sweet man!
keep us utd