New motor or rebuild?

jsnow36318 · Feb 19, 2017

I have a 98 k1500 silverado 5.7 vortec 316k miles, my motor has low compression in two cylinders 3&8. 3 is rings, 8 is valves. On top of that the whole engine is a vacuum leak, it leaks oil, and loses coolant... my question is should i replace it or rebuild it. If i rebuild how much would it cost for parts? New gaskets, rings, seals. Ill need to get the tools for reaming and honing/polishing the cylinders, a valve spring compressor and a valve lapping tool as well.

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Justin S · Feb 19, 2017

Save yourself the headache and get a used engine.

jsnow36318 · Feb 19, 2017

I have other engines that will need the tools eventually im more concerned about part price. I can do the work but is it cheaper to buy a 5.7 or rebuild one? I build bmws all the time. And it would cost less than 1000$ to do a full rebuild on my m50 whereas a head is 1500 or a whole motor is 3500. I dont want to buy a new motor if i don't have to.

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Justin S · Feb 19, 2017

You can find those engines all over for $500 already pulled. Rebuild would potentially cost just as much if not more, plus much more labor.

jsnow36318 · Feb 19, 2017

Really? What if i want a manual swap. Whats the chances i find one with a tranny. And what about the bigger transfer case input spline with the manual?

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Justin S · Feb 19, 2017

If you want a manual swap, might as well find yourself a whole donor truck so you have everything you need. Not sure where you're from, but just look around for one with a rusted frame for cheap

jsnow36318 · Feb 19, 2017

Im in south dakota, in the black hills. Thing is everyone has one and they are all missing the motor

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jsnow36318 · Feb 19, 2017

I found a 454 on craigslist for 400$ with 220k miles and its missing one cylinder

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jsnow36318 · Feb 20, 2017

The 454 has a broken dizzy and no tranny tho.

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MT Mike · Feb 20, 2017

405hp 383 Stroker from Summit Racing: https://www.summitracing.com/compare

When my engine gets tired enough, that's what I will be dropping into my truck.

New motor or rebuild?

jsnow36318

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Justin S

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jsnow36318

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Justin S

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jsnow36318

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Justin S

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jsnow36318

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jsnow36318

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jsnow36318

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MT Mike

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