"Ran OK but then a major coolant leak. Yup, the lower intake manifold gaskets rotted away. Common problem on GM 4.3L engines."
'98 350 also. Did mine myself also. So many wires and stuff that I just lifted them all up with most still connected with ropes tied around the hood to get at the manifold. Couldn't believe the mess I found in what was "supposed to be" a gasket. The after market, popular gasket mfgr, were in an aluminum frame with a molded silicon seal...like a poured in Oring. Professional quality.
After the job it ran real funny until I dug around and found that I hadn't reconnected the wire to the distributor. Must have been some computer controlled spark advance.
I'm now running a 2011 4.8 for the past 3.5 years and no problems what so ever, other than rats twice into the wiring harness.
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