Doc_Busa,
1600cc is unrealistic on a "street bike!"
As far as reliability it isn't going to happen on the street. From the need for multiple batt., to the starter crapping out if not kicking back and breaking something everytime you ride it. What aftermarket block are you speaking of? Everyone I have seen that goes big on the CC has popped because of to thin cylinder walls.
As far as the compression......to get the most out of a N/A 1600cc the compression is going to be up there if you want decent numbers. For the money and hassle, the big displacement isn't worth it IMO.
The Horse Power is very possible with a power adder, we are talking about a Naturally Aspirated 1600cc Hayabusa. I have seen over 550+ on TURBO Busa's, we are referring to motor only Busa's!
Sorry guys but 1600cc's isn't going to last long on the street! Even if it gets past the above mentioned problems it will burn its self up in traffic.
Josh