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Old 08-12-2000, 07:27 PM
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Join Date: Apr 1999
Location: Apex, NC USA
Posts: 176
Noticing the thick layer of black sludge beginning at the EGR port I have removed the crossover duct and the intake mainfold. These I can clean easily but what about the head. I can see the same layer of scum on the head walls and the valve stem.

Is there some way to deal with this or isn't it worht it?

1991 350 SDL
125,000 miles
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Old 08-13-2000, 12:16 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I don't worry that much about what is in the head. I clean out the big piece in the EGR and reinstall the tube. This will prevent damage from sucking in carbon.

Donnie Drummonds
1991 GMC Syclone
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Old 08-14-2000, 01:56 PM
Registered User
Join Date: Apr 1999
Location: Apex, NC USA
Posts: 176
One last thing, is there a sequence for tightning the intake manifold bolts? And what torque?

By the way I have cut a thin piece of stainless metal to install between the egr and the intake tube just to be certain.

Thanks for the help.

1991 350 SDL
125,000 miles
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