In 1986 the head went under a minor revision, the head bolts were increased from 7 / 16 to 1 / 2 inch.
12.
Design considerations include the fuel pump, fuel injectors, pistons, connecting rods, crankshafts, valves, head-gasket, and head bolts.
13.
Some engines developed cracks in the block that would leak coolant and / or oil, sometimes accompanied by broken head bolts directly above the crack.
14.
The LSX architecture incorporates specific design features such as reinforced internal components and additional head bolts with aluminum heads including twin Precision dual ball bearing turbochargers.
15.
The construction was aided by the two engines sharing a cylinder head bolt pattern, though the Boss heads had to have their coolant passages slightly modified.
16.
The cast-iron liners in the aluminum block version can also shift if the head bolts are not properly torqued and the engine is allowed to overheat.
17.
The cylinder head for the aluminum block is roughly 1 / 8 " wider than that for the cast iron block and uses a slightly different head bolt pattern.
18.
There were many differences between the Hemi and the Wedge-head big-block, including cross-bolted main bearing caps and a different head bolt pattern.
19.
Torque wrenches were being imported and sold alongside of the honing machines because it was known that uneven torque tightening of engine cylinder head bolts would distort the cylinder bore.
20.
Also more convincingly reported as a head gasket problem the 2AZ-FE aluminum block head bolt threads wear out on the back 3 middle bolts ( closest to firewall ).
