Pulled intake manifold to change gaskets

[movietvet]

i would consider dropping the oil pan and checking/cleaning it out. i could see the pickup being partially plugged with that much sludge in the valley.

Good call.

 

[454cid]

My opinion only. If I change lifters, I change the thunder stick.

Could you give some more insight on that? I'm not seeing the purpose, if it's just a case of lifters being gunked up internally, and not a wear issue at the cam.

 

[movietvet]

I see no problem if he reuses the same lifters. If you take the existing lifters out, you always put them back in the same hole, always. If I am going to have new lifters, I want a new cam. They get a wear on them for the cam and lifter. I do not want to mix. It is only my opinion.

 

[11bravo]

With 17 owners, you are best off just assuming ZERO maintenance has been performed. Change all fluids, filters, plugs and wires, at least. Take a close look at your belts, brakes, shocks, and all bushings. You may have already done this....

 

[GoToGuy]

You can get a kit bag from GM with a new set of intake upper bolts. Unless you have problems , taking anything out or apart my way cause a future problem. Use quality oil and filters.

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[movietvet]

Tap the threads for the intake bolts.

 

[Grube]

a lot of good ideas posted by several people. Will be doing most, if not all, of the suggestions. First I need to get some motivation.. I spent the day procrastinating at the river in the sun haha. Ah well, there is always tomorrow!

 

[tpass]

honestly if that were mine, I would bolt it back together as-is and plan a budget for a full rebuild of that one or a crate motor.

It's been like that for quite some time, so there is no sense stirring up the sludge or swapping out only the cam.

 

[rebelyell]

lemme see if I got all this right ---- current owner has only a few recent months history.
1997 5.7L Vortec, 27 years, 196700 miles, 17 owners, heavy HEAVY sludge and/or coking in valley.

Believe you me, with all that, the COOLANT jackets in both block And heads are Also HEAVILY fouled with scale + sediment + rusty muck. Filthy jackets Cannot efficiently transfer heat from motor to the coolant; too much of that heat is transferring to the Oil. A simple flush with water or wimpy liquid flushes on today's parts store shelves ain't gonna cut that crud; literally. You need a Strong Chemical CLEANING --- Google Oxalic Acid (DAP wood bleach). Job REQUIRES R&R block's drain plugs on Both sides. Reference GM TSB# 99-06-02-012D as good guidance.

 

[movietvet]

lemme see if I got all this right ---- current owner has only a few recent months history.
1997 5.7L Vortec, 27 years, 196700 miles, 17 owners, heavy HEAVY sludge and/or coking in valley.

Believe you me, with all that, the COOLANT jackets in both block And heads are Also HEAVILY fouled with scale + sediment + rusty muck. Filthy jackets Cannot efficiently transfer heat from motor to the coolant; too much of that heat is transferring to the Oil. A simple flush with water or wimpy liquid flushes on today's parts store shelves ain't gonna cut that crud; literally. You need a Strong Chemical CLEANING --- Google Oxalic Acid (DAP wood bleach). Job REQUIRES R&R block's drain plugs on Both sides. Reference GM TSB# 99-06-02-012D as good guidance.

I completely agree with what you said about the cooling system. I have worked on a 1991 K2500 with a 5.7, for the wife of an American Legion friend of mine, that recently passed. It is her truck. The pics I am about to post speak for themselves. I have only once changed the oil on it and it was very black and had small chunks in it. I have warned her and she said she would have the cooling system flushed out. I told her it would do no good.

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