hi,i have posted many messages on this site,all with good informative answers(cheers folks).i was going to replace cams and hydraulic lifters on my calibra 16v xe.i thought i may as well do the cylinder heads as well as it gives new valves and guides,in total a top end overhaul.powerzone in burnley do one at £425 exg.does anyone know about these and their reputation.also could anyone recommend a replacement for the same money.