With stock LS engines using stock or near-stock spring loads, the following technique is not really necessary. But for high-RPM LS engines with heavier spring loads &#; especially those using dual valve springs &#; you need to be aware of the load applied to each rocker bolt. This technique simplifies rocker arm installation, eliminating both the need for tracking individual cam lobe positions as well as the need to rotate the engine several times per cylinder with the EOIC method we talked about in a previous article that can be read here.
The first step of this technique is to install all the rockers and all the rocker bolts merely finger-tight. There will generally be at least three or four rockers on each head where lift is currently being applied by its respective cam lobe. You can easily tell which rockers are not under load by spinning or wiggling the pushrod by hand. Torque all the rockers where there is no cam lift to the requisite 22 lb-ft, and then turn the crankshaft over 180 degrees.
Since the cam spins at half speed, that will only rotate the cam 90 degrees, which should put additional cylinders on the base circle of their respective cam lobes. You can then identify the loose rockers and can then torque these rocker bolts in place. Repeat twice more, and then give all of the bolts a torque check, and you&#;re all set.
This technique reduces the load on the top portion of the aluminum threads while fastening the bolts into the head, while eliminating the need to remember any firing order, and reducing the number of times you need to rotate the engine. With these smaller metric fasteners used on the LS, this might just save you from pulling the threads out while installing rocker the rocker arms.
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LS Series Rocker Arms with upgraded Roller Trunions-
Installation procedures: Per GM Manual:
Rotate the crankshaft until the number one piston is at top dead center (TDC) of the compression stroke. In this position, cylinder number one rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position. The engine firing order is 1,8,7,2,6,5,4,3. Cylinders 1,3,5, and 7 are left bank. Cylinders 2,4,6, and 8 are right bank.
With the engine in the number one firing position, tighten the following valve rocker arm bolts: Tighten
.....(1) Tighten the exhaust valve rocker arm bolts 1,2,7, and 8 to 30 N·m (22 lb ft).
.....(2) Tighten the intake valve rocker arm bolts 1,3,4, and 5 to 30 N·m (22 lb ft).
Rotate the crankshaft 360 degrees.
Tighten the following valve rocker arm bolts: Tighten
.....(1) Tighten the exhaust valve rocker arm bolts 3,4,5, and 6 to 30 N·m (22 lb ft).
.....(2) Tighten the intake valve rocker arm bolts 2,6,7, and 8 to 30 N·m (22 lb ft).
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