Pontiac 12711770 Head Assembly, Cyl (W/ Vlv)

To perform this procedure, a new set of the MB (8 mm) and M11 (11 mm) head bolt will be required. First of all, start by removing the cable attached to the negative terminal of the battery. Take off the plenum and Intake manifold, valve covers, timing cover, timing chains, taking note of the position of the Sprocket to be meshed with crankshaft. On the left side cylinder head remove the fuel pump, The oil dipstick lube mounting bolt and tube.. Remove all electrical connectors and tap the ground straps from the cylinder heads, also remove the exhaust pipe/catalytic converter from cylinder heads. If doing the left side cylinder head removal it is advisable to also remove the power steering pump. Leverage out the upper bolt of the oil filter adapter if available then loosen all the head bolts with 1/4 turn each in the reverse sequence you used in tightening until you can do it by hand, it will be a good time to check the note of the lengths and sizes of the bolts as a guide to fit the new ones correctly. Remove the heads off the engine gently if there is resistance felt, use pry bar or long screwdriver and place the heads on wooden blocks so as not to mar the mating surfaces of the gaskets. Make sure block and cylinder heads mating surfaces are clean before assembly; use solvent to remove gasket and carbon as well as old gasket material using a gasket scraper; wipe clean with a rag soaked in lacquer thinner or acetone but be careful not to damage the aluminium covers. Ensure that there is no remnant of oil on mating surfaces since this can cause inadequate sealing and subsequently lead to formation of leaks, and clean the debris that falls on the cylinders using vacuum cleaner. Check the block and head mating surfaces for nicks and scratches, while using emery cloth for slight damage, for excessive damage you should machine. Put the new gaskets over the dowels in the block and lift the heads and put them back on the block in a manner that will not shift the gaskets. Apply a layer of a medium strength thread locking compound to the threads of the new 8mm head bolts; start those bolts without using tools and then do the same for the new 11mm head bolts. According to the described sequence, tighten the bolts in four cycles, to the given torque and the angle of turn. Whatever is left of the installation is removed in the opposite sequence to the process of instalment. Last but not the least, pour in coolant, replace the oil and the filter, switch on the engine and make sure that all is well and look for signs of coolant or oil leaks.

This brings us the need to buy new head bolts to enable them perform this procedure. Start with removing the cable from negative terminal of the battery and then drain the coolant in the engine. On L99 and LS3 as long as they do not have the supercharger, the way that intake manifold requires to be removed is how you have to do it by the removal of the coolant bleed pipe mounting bolts and the pipe on it. In the case of LSA engines, one has to take out the supercharge. Subsequently, one must come off the valve covers, exhaust manifold(s), rocker arms and the pushrods as well. Store all parts in a proper manner so that they may be fitted in again later. Turn these head bolts in an opposite sequence to that of tightening, a quarter turn at a time until the bolts can be unscrewed by hand; discard these bolts and use new ones, where necessary, when replacing the units. It is obvious that heads bolts will be of variable and sizes and some are long while some are short and therefore make a note of size and position when removing them. If there is a need to raise the heads off the engine some more, doing it gently will be advisable and if you feel any form of resistance use prybar or long screw driven in the intake port and set the heads apart on wooden blocks to avoid damaging the sealing gasket. After the honing process, always make sure that both the cylinder head and block mating surfaces are clean; when using scraper be very careful so as not to cut the aluminum. These surfaces should be smooth, look for nicks or scratches then if the damage is slight then use a file to smoothen, if the damages are big then an automotive machine shop should be used. Wipe the surfaces with shop towel and use the brake system cleaner to wipe them and to clean the head bolt holes use the tap. Place the new gasket over the dowels in the block with the mark on the head gasket to the front of the vehicle. Be very careful not to lift the heads off the block in doing this and make sure that the gaskets are still in place before inserting the new head bolts and tightening them with your fingers. As indicated in the suggested procedure for the proper sequence of tightening the bolts, turn the bolts four times to the required torque and the angle of rotation. Replace the cooler outlet gasket with the new y-tube O-rings ; M8 cooler bleed pipe bolts to cylinder head 30Nm. The rest of the procedure is the direct mirror of the removal and proceeds from bottom to the top. Last but not the least, pour some coolants, replace the engine oil and the filter, turn the engine on and ensure that all its functions are normal and that there is no leaking of the coolant or the oil.

The initial steps to remove the right cylinder head include draining the cooling system and removing the intake manifold, valve covers, pushrods, and exhaust manifold(s).

Begin by disconnecting the cable from the negative terminal of the battery and draining the cooling system.

Chase the threads in the cylinder head bolt holes with a tap and clean the threads with a die.

Replace all head bolts with new ones.

For the right cylinder head, remove the dipstick tube and disconnect ground cables from the front of the cylinder head.

For the right cylinder head, remove the dipstick tube and disconnect ground cables from the front of the cylinder head.

Position new gaskets on the dowels in the block, place the heads on the block without disturbing the gaskets.

Ensure the cylinder heads and block mating surfaces are clean and free of debris. Use a gasket scraper and brake system cleaner to clean surfaces, and check for any damage that may require machining.