Just wondering my cab has a 1.6cvh rst engine and a chip and a -31 just wanted to know how much more power would i have got if i went zvh instead if cvh.
Cheers for any help.

 

Only as much as the cylinder head/cam/turbo will flow. If you're just going to run the exact same set up top end and management (basically everything the same but a different bottom end, then you will produce roughly the same power. The only benefit will be that the extra gasses the 1800 can shift at low/off boost RPM will just help to spool the turbo up a little quicker.