Grade B to grade C ? - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 18 (permalink) Old 11-17-2012, 11:02 AM Thread Starter
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Grade B to grade C ?

Does it matter if we install a grade c head gasket versus the original grade B???

Whats the torque spec for arp head stud?
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post #2 of 18 (permalink) Old 11-17-2012, 12:20 PM
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Quote:
Originally Posted by QuadRacer450 View Post
Does it matter if we install a grade c head gasket versus the original grade B???

Whats the torque spec for arp head stud?
Everyone told me to use grade C. I had grade b from factory. But the machine shop took .003" off the heads.

. The torque sequence is in the box for the studs.

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post #3 of 18 (permalink) Old 11-17-2012, 01:26 PM
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Grade c will be fine regardless of what came off originally. Like said above, the torque sequence should be in the box on a piece of paper

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post #4 of 18 (permalink) Old 11-17-2012, 01:36 PM
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So you don't have to make up the difference of thicknesses by shaving the head ?


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post #5 of 18 (permalink) Old 11-17-2012, 01:45 PM
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Grade c covers all

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post #6 of 18 (permalink) Old 11-17-2012, 02:06 PM Thread Starter
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thanks its done !!! for one side :P
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post #7 of 18 (permalink) Old 11-17-2012, 02:11 PM
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Quote:
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Grade c covers all
not true. It depends how much the heads get machined.

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post #8 of 18 (permalink) Old 11-17-2012, 02:31 PM
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These heads do not have combustion chambers. So why does milling the head effect the required gasket thickness? Is it because of the valve seat depth from the cylinder head face?

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post #9 of 18 (permalink) Old 11-17-2012, 06:18 PM
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Quote:
Originally Posted by gmctruck44 View Post
These heads do not have combustion chambers. So why does milling the head effect the required gasket thickness? Is it because of the valve seat depth from the cylinder head face?
bingo

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post #10 of 18 (permalink) Old 11-17-2012, 06:33 PM
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Head gasket thickness is based off of piston protrusion. If the heads are done properly and the valves set within the factory service limit there is no change in piston to valve clearance.

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