not really only if the tappets are changed from hydraulic to adjustable, as for tappets being just done it means nothing as for one your trusting the sellers word, I bought a fiesta turbo just after christmas and seller told me it had a recent complete top end rebuild and mine sounded like a bag of spanners on tickover, bought new lifters from matt lewis for £45 its now as quiet as a mouse, check all the breathers etc too as they are known to block up which does not help, also check lobes on cam when changing tappets