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Old Yesterday, 07:23 PM   #1
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Default 300k rebuild

Alright, first post and I know it's probably already been discussed, I have a small head gasket leak and I put some blue devil in it for now, it's winter, I'm hoping it'll last through the cold months then I plan on fixing it properly. My question is should I motor swap or do a rebuild? Truck is a 97 and has 302k on it as of now. I can't decide between doing a rebuild myself, motor swapping or just say f it and get another f150 or a f250. Price isn't the issue just time to do the build myself with me working seconds. Another question I have is should I just do a top half rebuild or do the entire motor.. looking at possibly upgrading from stock just don't know where to begin looking for options. Any advice would be greatly appreciated.
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Old Yesterday, 08:40 PM   #2
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whats the condition of the rest of your truck?

At 300K, unless its really good condition, and you WANT to keep the truck several more years, it wont pay to fix it at all.

At the time I put a reman engine in mine at 200K, I spent about $7000 total on it doing things like brakes, ball joints, interior, seat heaters, backup camera, new seat cover, tires, etc. That was 2.3 yrs, 47K ago. Only spent $150 since on alternator. Ive broken even on the $4400 for engine replacement now. Way I see it, even a newer used vehicle will depreciate by almost 2000 per year. I dont want to be fixing things all the time, so fix everything at once, then just drive it several years.

One looming issue is at 300k, you can likely expect transmission replacement during the life cycle of another engine. Which skews the economics toward just get another truck . Of course in good condition, you can replace both with used items for a couple thousand, and drive for several more years.

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Old Yesterday, 09:25 PM   #3
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Quote:
Originally Posted by mbb View Post
whats the condition of the rest of your truck?

At 300K, unless its really good condition, and you WANT to keep the truck several more years, it wont pay to fix it at all.

At the time I put a reman engine in mine at 200K, I spent about $7000 total on it doing things like brakes, ball joints, interior, seat heaters, backup camera, new seat cover, tires, etc. That was 2.3 yrs, 47K ago. Only spent $150 since on alternator. Ive broken even on the $4400 for engine replacement now. Way I see it, even a newer used vehicle will depreciate by almost 2000 per year. I dont want to be fixing things all the time, so fix everything at once, then just drive it several years.

One looming issue is at 300k, you can likely expect transmission replacement during the life cycle of another engine. Which skews the economics toward just get another truck . Of course in good condition, you can replace both with used items for a couple thousand, and drive for several more years.
I forgot to add that it is the 4.6

But the rest of the truck is in great shape, transmission was just done 5k ago, new alternator, spark plus,wires, and coils, manifolds recently upgraded to flowtech shortie headers,new egr valve and tube, new water pump, ball joints have been done, only issue I'm having now is u joint going out, and now white smoke from exhaust at idle, my brothers a GM mechanic and he's looked at it and said he doesn't believe it's a head gasket but I'm under the impression that it is because I have no idea what else would cause white smoke, it's not losing coolant, no bubbles in the fluid when at temp with cap off, no sweet smell, no lose of power either
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Old Yesterday, 09:29 PM   #4
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If you think your head gaskets leaking and you pretty much have to lose coolant at some point. Manifold gasket leak is very very similar. Your deepest vacuum is at idle and so that's when your leak will be the worst and it will just suck coolant right into the intake but you will lose coolant at some very low rate

If you've done all that work and your trucks in good shape then sounds like a good candidate to fix whatever it takes and keep driving it
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Old Yesterday, 09:46 PM   #5
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https://www.summitracing.com/parts/fem-csmhp795-000

This is the kit I'm looking at for the rebuild, unless someone can suggest something that would be a better upgrade, and I can't decide if I want to rebuild the bottom half and redo the cams and crank or not.. I do know after rebuilding I'm adding cold air intake, and upgrading injectors
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