I had thought about changing the cam lift and duration.
I was thinking that reducing the duration and lift a little wrt the stock would benefit the VE and response at the low and mid range rpm due to the following reasons.
1) As the engine is restricted, it would behave, on the stock camshafts, like a normal engine fitted with performance camshafts with higher lift and duration.
2) When the engine is restricted the velocity of charge entering the cylinder at lower rpm is lower than when unrestricted and does not fill the cylinder efficiently. Hence reduced duration and lift would increase VE here.
3) We have always had lumpy idling. This seems like the problems that would be faced when a stock engine (unrestricted)
is fitted with camshafts of higher lift and duration to increase performance at high RPM. Considering we run a restricted engine and design for a lower resonant RPM and lower red line, a camshaft with a lower lift and duration should help.
It'd be great to hear opinions on this. Also what problem could be face because of the modifications?