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 Ect

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Old 11-17-2012, 11:02 AM   eBay Motors  #1 (permalink)
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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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Old 11-17-2012, 12:20 PM   eBay Motors  #2 (permalink)
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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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Old 11-17-2012, 01:26 PM   eBay Motors  #3 (permalink)
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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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Old 11-17-2012, 01:36 PM   eBay Motors  #4 (permalink)
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So you don't have to make up the difference of thicknesses by shaving the head ?


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Old 11-17-2012, 01:45 PM   eBay Motors  #5 (permalink)
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Grade c covers all
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Old 11-17-2012, 02:06 PM   eBay Motors  #6 (permalink)
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thanks its done !!! for one side :P
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Old 11-17-2012, 02:11 PM   eBay Motors  #7 (permalink)
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Quote:
Originally Posted by blunova View Post
Grade c covers all
not true. It depends how much the heads get machined.
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Old 11-17-2012, 02:31 PM   eBay Motors  #8 (permalink)
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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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Old 11-17-2012, 06:18 PM   eBay Motors  #9 (permalink)
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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?
bingo
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Old 11-17-2012, 06:33 PM   eBay Motors  #10 (permalink)
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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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