Hmm, to tell u the truth i hantam my car almost daily with rpm reaching near cut off point (usually until 6.5k).. lash adjuster noice is still very minimum, got it serviced once oni.. I think as long as lubricant level ok and using the appropriate spec it is no prob to drag.. dont worry of having heavy foot, i think my foot much heavier than urs.. hahahah..hornydrifter said:sound came after event power after 2days hantam....think i got heavy foot...
instead of installing 1.8 head, why not put in the 1.8 head internals into ur 91 head.. ports of 1.8 head are way bigger, might affect (worsen) ur engine response.