Advice for LT4 rocker install?
Thread Starter
Drifting
Joined: Jul 2001
Posts: 1,296
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From: Largo Florida
Advice for LT4 rocker install?
I am going to be putting the rockers back on tonight and wanted to hear from you guys about the best method. I have all stock components. I read in the manual that you just torque them down and that was it. Is that the best way?
I have been reading about all these rocker issues lately and am concerned.
I have been reading about all these rocker issues lately and am concerned.
Race Director
Joined: May 2001
Posts: 14,165
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Re: Advice for LT4 rocker install? (ericcer)
If I remember correctly the LT4 rockers don't have an adjustment. As such you should be able to just torque them down.
I would assume that the torque spec is for the valve completely closed, so you'll want to make sure that the lifters are completely bottomed out on each cylinder before you torque them. If the lifter isn't bottomed out and you torque it you can collapse the lifter, or not compress the spring enough and it will too loose.
I would assume that the torque spec is for the valve completely closed, so you'll want to make sure that the lifters are completely bottomed out on each cylinder before you torque them. If the lifter isn't bottomed out and you torque it you can collapse the lifter, or not compress the spring enough and it will too loose.
Safety Car
Joined: Jun 1999
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Re: Advice for LT4 rocker install? (ericcer)
Yes, stock LT4 rollers are just torqued down. Do you have the torque specs? Helms manual says tighten to 18 ft lbs.
Here are the instructions:
a. Turn the crankshaft until the cast arrow on the crankshaft balancer hub is at the 12 o'clock position and the #1 cylinder is in the firing position (top dead center). You will see both the intake and exhaust valves on #1 in the close position. Adjust the following valves:
Exhaust: 1,3,4,8
Intake: 1,2,5,7
b. Turn the crankshaft 1 revolution until the hub arrow is at 12 o'clock. This is the number 6 firing position.
Adjust the following valves:
Exhaust valves: 2,5,6,7
Intake valves: 3,4,6,8
To make it easier to rotate the engine, the spark plugs should not be installed. This also prevents damage to the hub bolt and threads in the crank nose.
[Modified by Mez, 9:58 PM 8/27/2002]
Here are the instructions:
a. Turn the crankshaft until the cast arrow on the crankshaft balancer hub is at the 12 o'clock position and the #1 cylinder is in the firing position (top dead center). You will see both the intake and exhaust valves on #1 in the close position. Adjust the following valves:
Exhaust: 1,3,4,8
Intake: 1,2,5,7
b. Turn the crankshaft 1 revolution until the hub arrow is at 12 o'clock. This is the number 6 firing position.
Adjust the following valves:
Exhaust valves: 2,5,6,7
Intake valves: 3,4,6,8
To make it easier to rotate the engine, the spark plugs should not be installed. This also prevents damage to the hub bolt and threads in the crank nose.
[Modified by Mez, 9:58 PM 8/27/2002]
