I’m changing the plugs in my fiesta I’m running cosworth management I’m running qc57 spark plugs at the minute I just want to know what’s the best plugs to put in her I’ve been told the ik27 plugs or the agp12pp8 big escort cosworth plugs

 

071 seems a good plug, I use these. Although not on a CVH, although can’t imagine it makes much difference?

Martin