Make sure the engine has come to room temperature before you go ahead and free the cylinder head bolts. Take the connection of the cable with the negative terminal of the battery, then, un-bolt the intake manifold and disconnect the wires and vacuum hoses belonging to the cylinder heads and label them for reuse. Remove the bypass wires of the ignition, and take out the spark plugs, being sure to mark the wires at the same time. Take off the
Exhaust Manifold, valve covers,
Rocker Arms and the push rods. Taking a new cylinder head gasket put the contour of the cylinder head including the bolt locations on the cardboard with arrows showing the front of the engine. Remove the cylinder head mounting bolts one at a time in the reverse of the pattern used while tightening, turning each a quarter turn apart from finally placing them in a cardboard holder. Remove the cylinder heads from the engine carefully without scratching the mating surface; if there is much resistance, look for any bolt that might have been left out and which will require you to use a hammer and a wooden block in order to loosen the gasket. When removed, it is recommended to put cylinder heads on wooden planks in order to avoid scratching. The cylinder heads should also undergo through the services of a professional automotive machine shop. Make sure that each cylinder head mating surface and the engine block mating surfaces are free from any form of carbon deposite and old gasket material before installation using gasket scraper to scrape off the deposits and then wiping the surface clean with either lacquer thinner or acetone. If you had to use a file on the mating surfaces, it should be checked for nicks or other forms of damage; if you have to machine the mating surfaces, again check for nicks or other forms of damage. Bring a tap to run in the cylinder head bolt holes. Align the new gasket over the dowel pins in the engine block, make sure the markings if any, are facing upwards and towards the front, and place the cylinder head over the engine block in a similar manner so as not to displace the gasket. Carefully examine each cylinder head bolt for necking-down or stretching by holding it on a straight-edge; replacing all bolts that do not touch the straight-edge. It is recommended to tighten the head bolts in the recommended sequence and to the specified torque, then to tighten them again to the same torque as a check, and then to turn them additional 90 degrees the same sequence without using a torque wrench. If you have removed the components in a clockwise direction, then installation of the remaining components is done in a similar anticlockwise sequence.. Replace the oil and the filter, fill the cooling system, power up the engine and look for leaks and proper functioning.