need lt4 rocker arm torque spec please

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May 6, 2007 | 10:41 AM

bent

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Burning Brakes

Joined: Jul 2006

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From: Sulphur LA

need lt4 rocker arm torque spec please

I am changing valve springs at my dad's house and forgot my FSM. I do remember that when setting "lash" that it specified to torque the rocker nuts instead of the usual tighten untill the pushrod won't spin + 1/2 to 3/4 turn. can anyone look up the spec/procedure for me???? thanks so much

May 6, 2007 | 10:42 AM

Pete K

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With the valve you are adjusting closed, and the cam lobe on the base circle, zero lash + 1/2-1 full turn is fine.
I normally go 3/4 turn.

May 6, 2007 | 11:05 AM

bent

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Burning Brakes

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From: Sulphur LA

thanks, pete. I feel pretty safe doing the usual method, but I wonder why the factory service manual had a torque spec???

anyone??

May 6, 2007 | 11:07 AM

Pete K

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Quote:

Originally Posted by bent

thanks, pete. I feel pretty safe doing the usual method, but I wonder why the factory service manual had a torque spec???

anyone??

I have never seem a torque spec listed on a gen 1 sbc.
Possibly you are thinking of the rocker stud torque?

May 6, 2007 | 11:34 AM

Corvette Kid

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From: Good health is merely the slowest possible rate at which one can die

St. Jude Donor '04-'05-'06-'07

Quote:

Originally Posted by Pete K

With the valve you are adjusting closed, and the cam lobe on the base circle, zero lash + 1/2-1 full turn is fine.
I normally go 3/4 turn.

Unlike the LT1 and other SBC engines, the LT4's rockers are not adjustable. I'll see if I can find your torque spec.

Here we go, 18 lb.-ft.

Last edited by Corvette Kid; May 6, 2007 at 11:42 AM.

May 6, 2007 | 12:08 PM

bent

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Burning Brakes

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From: Sulphur LA

thanks, kid!!

May 6, 2007 | 12:15 PM

bent

Thread Starter

Burning Brakes

Joined: Jul 2006

Posts: 1,230

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From: Sulphur LA

I did forget to mention....I do have the hot cam....would this affect the required torque?

May 6, 2007 | 12:47 PM

STL94LT1

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From: O'Fallon Missouri

Quote:

Originally Posted by bent

I did forget to mention....I do have the hot cam....would this affect the required torque?

No.

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