Look carefully at the IVA manual but it seems quite likely that changing the engine post IVA could require at least a partial retest. You would be required to inform DVLA of change of engine number and provide neccesary documentation for this so 'pulling your collar up and keeping a low profile" may not work.
The IVA sets out the emissions requirements which are now related to the engine you have fitted. Changing the engine to a more modern engine will require you to meet the emissions requirements for the engine you fit that could include cat and engine management for a late Zetec....
Get an early Zetec (pre 1995 I think - again check the IVA test manual) then build and IVA with that.
Last edited by Big Vern : 2nd June 2009 at 09:11 PM.
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