Based on this subject, are 1.8 sierra blocks, (or a standard RS block bored out to 1.8/1.9) any good?

I too am also having a mass-debate (sorry ) over whether to go ZVH or stay CVH, personally to me a ZVH just isnt a true RS anymore. The logical explanation to get even more power to me would be to bore out or get a sierra block, but no-one seems to run one so im guessing this doesn't produce good results?

I'm all for CVH though, and for those who moan about noisy top ends just get your wallet out and buy a nice new cam and some hydraulic lifters, it will be quiet for years then, instead of trying to run your originally supplied 150,000 odd mile cam with thick oil