"they use cast pistons and the blocks crack easily

the standard internals power limit is the same has the 1.6 cvh around 260 bhp

they are good for a low boost engine but the max power limits around the same has the 1.6 so what's the point"

Thats what I needed to know. Cheers fella. Pointless for me then as I'm upgrading my bottom end as I don't trust it on 18.5PSI.