just put cylinder head back on escort td 1998 s reg and there is 3 stages to tighten bolts..
stage 1 .. tighten bolts 10Nm in sequence
stage 2 .. tighten bolts 100Nm in sequence
stage 3 .. after 3 minutes slacken bolt number 1 off 180* then tighten it
70Nm then tighten a further 120* then repeat stage 3 with rest of bolts in sequence .. finshed

why do you slacken bolts off . on all the cars i worked on before you just tighten them in sequence never slacked them off before