I think you are probably at about the limit of the stock motor, but so much depends on use. A car that could be dead nuts reliable for 10s of thousands of miles for the occasional hard pull on the street might not make it through a 20 minute track session.
The failure point for me was head gasket. It was set for 7psi, though it was over-boosting a bit due to cold temps- data logs show it was at 9psi. Mind you, I abused the snot out of the motor for a few years prior, and it bounced off the rev limiter for several seconds prior (autocross run with no time to shift).
I'm going with the O-ring method for version 2.0, along with forged pistons/rods, and stronger liners. I'm not sold on epoxy for the liners, but I suppose I will consider it if version 2.0 blows. I'm planing on at least doing a tune for 300whp for that one, though I will probably turn down the wick for track days.
Others are right that the open deck is the biggest limitation. A deck plate to convert it to a semi closed deck could probably rectify the situation cheaper than a monoliner. But if you aren't doing Bonneville top speed runs or 24 hour endurance races, I think you are overwhelming the chassis at power levels below where a monoliner becomes necessary. Any solution will require custom work. Unfortunately, our Alfas aren't like tuner cars where 1,000whp+ capable billet blocks can be ordered off the shelf.
Last edited by nealric; 06-03-2019 at 11:07 AM.