C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Cylinder head torque specs?

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Old Mar 16, 2005 | 08:03 PM
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Default Cylinder head torque specs?

Hey folks, I tried the search function, but it's taken about 10 minutes now, and it's still searching. I'm looking for torque specs for the L98 aluminum heads. On my cast iron heads, I torqued them initially to 40, then retorqued to 60, but I'm thinking the torque specs might be different for aluminum heads. Thanks in advance folks!
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Old Mar 16, 2005 | 09:24 PM
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I am going to replace the iron heads on my 85 with AFR aluminum heads. Have them in the back room still in the box for another week or two. AFR suggests torque to 65-70 ft/lbs. INITIAL TORQUE 40 ft/lbs then increase by 10 ft/lbs increments to final torque. Moly lube should be applied between fasteners, washers and area around head bolt to prevent falling and improper torque values.

Hope that helps.
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Old Mar 16, 2005 | 09:35 PM
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Shop Manual says 67ft. lbs. GOOD LUCK
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Old Mar 16, 2005 | 10:19 PM
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The torque value is dependent as well on what you coat the threads with. Make sure you know what your torque values are for.
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Old Mar 16, 2005 | 10:59 PM
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Originally Posted by scorp508
The torque value is dependent as well on what you coat the threads with. Make sure you know what your torque values are for.
Exactly. 65-70 ft-lbs with moly lube, 85 ft-lbs with 30-weight engine oil.....this is for aluminum heads.

Last edited by Red Tornado; Mar 17, 2005 at 07:03 AM.
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Old Mar 17, 2005 | 02:05 PM
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You covered specs with moly and 30wt oil, but what would the torque specs be with thread sealant?
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Old Mar 17, 2005 | 05:37 PM
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thread sealant would be the same as moly lube, in terms of torque values.
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