Truck has a 350 engine
Jack up truck for safety sake put jack stands under frame . remove all engine oil remove all bolts holding oil pan on if their is not enough room to drop pan you may have to remove bolts holding motor mounts and jack up engine. if front end linkage is still in the way remove linkage. pull oil pan out. check gasket that was between block and oil pan if any stuck to block of engine remove with gasket scraper or wire brush or wire wheel on drill.make sure mating surface is clean put new gasket on new oil pan I like to use a high temp sealer on gasket both sides. Put pan with gasket back in place of old oil pan and tighten all bolts. jack engine down ,replace moter mount bolts replace any linkage you took apart. and dont forget to replace engine oil. make sure oil plug is in pan before pouring oil in . before starting engine check that no oil is leaking than start engine and check for any leaks again if all is good your done. if this was helpful please leave good feed back. A good temp fix on a rusted oil pan is JB weld make sure no oil is on pan clean with towel and rubbing alchol .you may have to drain oil first. if it is rusted badly you may have to use a wire brush on a drill to clean the area to patch. if patched properly it may last for years.
SOURCE: I have a 1998 GMC
If it has a bunch of miles on witch I'm guessing it probably does you can try to adjust your rocker arms. This seems to more of an art then I science for me, I always have to have someone help me. See *** the cam, push rods, & lifters ware the rocker arms loosen up some. It was explained to me that you just want them tight enough you can still see them rattling around has to be done with engine running and valve covers off. Make sure you have at least a couple quarts of oil laying around.
here is a video on how to do hydraulic lifters http://www.youtube.com/watch?v=HSR36fmBR6M
here is a video on roller rockers http://www.youtube.com/watch?v=ktvIQgGhz18
More instruction can be found online or maybe you have a friend that is experienced in adjusting them.
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