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Can they be installed from the bottom up? By removing the oil pan?

 
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Doubtful, you have to hammer them downward. I guess you could hammer them upwards but seems silly.

 
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I Think you have to take off the head and oil pan for sure. Did you get your pistons and rods already from that member? You got a hella deal

 
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nah they can't. everything has to be checked for clearances. plus the crank would be in the way if you tried to put them on. botta take the head off and oil pan.

 
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how about someone write up a DIY with pics???

 
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mostly because its not a simple diy. Every one is a lil different and you hafta have experience and the right tooling. Cylinders need honing. Clearances need to be checked. Rings need to be filed and the gaps need to be in the right place. Pistons and rods should at least be weighed and matched to each other. Its not a slap in project. sometimes you can get away with hacking it together but I recomend taking the motor out and having it cleaned, honed, and checked for any inconsistancies that may need to be adressed. Its well worth taking the time to do it the correct way the first time. Your motor will usually last longer and/or make a little more power. Assembling and engine isnt just tossing rods and pistons in, it can be very decieving of how involved of a project it can be.

 
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This is the closest thing you'll get to a DYI
for motor build up click here

 
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I know its a tough job, I doubt I would attempt that myself. Would it even be worth doing pistsons and rods on a motor with almost 100,000 miles? The block itself should be fine, its just the moving parts, that if replaced, should make it like new again? Its great how 4 years later they finally have stuff to build the motor, if only I saved all the money I put cosmetically in to my car! How much would labor charges on avergage typically cost for rebuilding an engine?

 
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I would also like to know how much labor charges are for rebuilding an engine?

 
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It varies from shop to shop.
Some shops charge by the hour some by the job.
There also machine shop charges.
If all posible gets a shop that has it all withing their facilities.
My advice, shop, shop, shop.
write down all you need to do and go out ask questions and get prices.
You don't want to take any short cuts, belive me, they will come back to hunt you latter.

 
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yep make sure to ask a lot of people about the shop you are thinking to go with as well. There are many engine builders in my area and only like 2 are any good. They charge a ton but there work is perfect. I have a clean, climate controlled room in my basement where I build engines for friends, as well as anything I may need. I was trained in basic engine building working at a speedshop and I have since learned much from other builders, hands on experiences, and f-ing stuff up. I have no idea what it costs to assemble an engine but I would assume without machining or parts, the assembly would cost between 500 and 1500 for a honda, but it depends on what you are doing with it as well.

 
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i do believe they have to be put in from the top

 
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No.

They must be put in from the top so you have a level surface. This is required so you can properly insert the pistons with the rings completely compressed. If you try to do this from the bottom, it will most likely result in a damaged ring, which can lead to even more damage when you start the motor.