if yer tightening head bolts isnt it 15 lb then 90 deg on em all then 90 again on em all?
also when removing steel nuts from ally, if they are stubborn, boil the kettle and pour the water onto the ally, the ally will expand enough to crack the bolt!!!
not tried in on heads tho but i reckon its safer than flames. i have done it on the two front bolts on the plenum that hold the connector to the top hose, well on one of em as i had already killed the first one!! worked a treat and i only had to tap one hole instead of both!
also when removing steel nuts from ally, if they are stubborn, boil the kettle and pour the water onto the ally, the ally will expand enough to crack the bolt!!!
not tried in on heads tho but i reckon its safer than flames. i have done it on the two front bolts on the plenum that hold the connector to the top hose, well on one of em as i had already killed the first one!! worked a treat and i only had to tap one hole instead of both!