Chevrolet introduced its C/K line of trucks in 1960. This line, which included the C1500, was available until 1999 when it was replaced by the Chevrolet Silverado and the GMC Sierra. In 1997, the C1500 was available with two engines depending on the trim: a 4.3-liter V8 and a 5.7-liter V8. The larger engine was available only in the C1500 SUV model. To ensure engine stability, engine bolts must be torqued or bolted down to certain weight specifications.
In an engine, the cylinder head, also known simply as the head, sits atop the cylinders on the cylinder block. The apparatus consists of a platform that includes valves and spark plugs.
Torque refers to the force required to rotate an object, in this case a nut or a bolt, around an axis or pivot. You can think of it as a twist. Some torque must be applied in a helical sequence. In this sequence, the torque should first be applied to the center bolt. Then work your way outward in both directions from the center evenly. If there are multiple steps to the sequence, apply the first step to all of the bolts in the helical sequence, then apply the second step to all of the bolts in the same sequence, and so on.
In the 4.3-liter V8, the cylinder head requires three steps in a helical sequence. The bolts first receive 25 pound-feet of torque, then 45 pound-feet, then 65 pound-feet. Wait about 15 minutes between each step of the sequence to allow the bolts to stretch and settle.
The exhaust manifold bolts to the cylinder head with 20 pound-feet of torque. The intake-manifold-to-cylinder-head bolts require 33 pound-feet of torque. And the rocker arm stud requires 50 pound-feet of torque to join properly to the cylinder head.
The four end bolts of the cylinder head require 100 pound-feet of torque to join to the engine block properly. The remaining bolts require 95 pound-feet of torque. Both the intake manifold and the exhaust manifold bolt to the cylinder head with 40 pound-feet of torque. The rocker arm studs screw to the cylinder head with 55 pound-feet.
