[Butcher]

I doubt it, the EFI system would not care. Maybe the knock sensor would 'hear' more noises, but I doubt it.

 

[Butcher]

I'm not into that much science but bigger is better. There is no bragging rights when you say you got stock size valves.

What I normally do when I 'rebuild' a head is replace the valves with 7mm stems [ABA] and install the 41mm intake valves since the stock ABA valves are really 39.5mm.

Not certain what options you have since you want to use a solid lifter head. For my driving style, I see no gains with a solid lifter head. I like the idea of a set it and forget it type of valve adjustment.

 

[Butcher]

I'm just sharing my thoughts. There is no way I'm saying I'm right.