INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

setting rocker arms

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Old Jun 16, 2015 | 02:58 PM
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Default setting rocker arms

So i have my new ls3 heads on, trunnion upgrade done to stock rockers. I assume this is the process next on setting the rockers?? easier way?

6. Rotate the crankshaft until number one piston is at top
dead center of compression stroke.
In this position, cylinder number one rocker arms will be
off lobe lift, and crankshaft sprocket key will be at the
1:30 position. If viewing from the rear of the engine, the
additional crankshaft pilot hole (non-threaded) will be in
the 10:30 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.
Notice: Refer to Fastener Notice in Cautions and Notices.
7. With the engine in the number one firing position,
tighten the following valve rocker arm bolts:
Tighten
• Tighten exhaust valve rocker arm bolts 1, 2, 7 and 8
to 30 N.m (22 lb in).
• Tighten intake valve rocker arm bolts 1, 3, 4 and 5 to
30 N.m (22 lb ft)
8. Rotate the crankshaft 360 degrees.
. Tighten the following valve rocker arm bolts:
Tighten
• Tighten exhaust valve rocker arm bolts 3, 4, 5 and 6
to 30 N.m (22 lb ft).
• Tighten the intake valve rocker arm bolts 2, 6, 7 and
8 to 30 N.m (22 lb ft).
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Old Jun 16, 2015 | 03:05 PM
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I have a gauge for that
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Yea so thats the formal way....

The easy way is to torque them all down to 22ftlb (use a dab of threadlocker on the bolts). Spin the crank a couple of times over, and double check all the bolts and you are good to go!

Last edited by Atomic; Jun 16, 2015 at 03:40 PM.
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Old Jun 16, 2015 | 03:22 PM
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haha i figured so, thats what i have read in other places. It just seems weird you can do that but i guess these newer models are easier to work with than the older ones where you had valve lash as an issue.
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Old Jun 16, 2015 | 03:41 PM
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Exactly, these are hydraulic roller engines, not flat tappet solid rollers that require a lot more attention.
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Old Jun 17, 2015 | 08:35 AM
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does it matter where the key position is on the crank? It says it needs to be at 1:30 position but it isnt when the dots are lined up. Would think if dots are lined up everything is good?
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Old Jun 17, 2015 | 09:02 AM
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I have a gauge for that
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The key position is not lined up at the 12 oclock position when number 1 cylinder is at TDC, it actually points straight to it (the cylinder). If dots are lined up, everything should be good. The proper way to do it is to degree in your cam, which is a slightly more involved process that is much easier with the head off, but can be done with it installed.
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