I'm getting close to 100,000 on my LS2 and am thinking of just buying a new shortblock,use my heads and Acc, and pick up a fast intake.
would I have any problems if I used a larger CID
lower end purchased from some reputable source. the LSX is a little more weight, but hard to hurt. The LS7 is more cubes but how much HP would be lost to the LS2 heads? There seems to be a huge $ between longblocks and shortblocks

I would go with the more cubes if you have the cash for it. I'd like a larger engine :drool5: :coffeetime:

I'm getting close to 100,000 on my LS2 and am thinking of just buying a new shortblock,use my heads and Acc, and pick up a fast intake.
would I have any problems if I used a larger CID
lower end purchased from some reputable source. the LSX is a little more weight, but hard to hurt. The LS7 is more cubes but how much HP would be lost to the LS2 heads? There seems to be a huge $ between longblocks and shortblocks

It all depends on what you want. First of all, is there anything wrong with your current engine? It is very common for these engines to go well past 100,000 miles without any issues and unless you car is heavily modded or abused I'd be very surprized to find that there was anything at all wrong with the motor.
If you are just modding for the sake of making power the best bang for your buck would be having the engine stroked; there is nothing o "wear out" on your block itself, so you can keep the engine block and swap out all the internals. A cylinder wall rehone and a complete stroker build bringing your engine up to 402 cubic inches can be done for under 4 grand. While it is all apart you can swap in a bigger camshaft, new valve springs, retainers, and pushrods, a new oil pump, gaskets, bearings and have a completely new engine that will make a lot more power than your original LS2 ever did. I am going that route minus the stroking and it is setting me back around $5500 out the door shipped with the engine completely blueprinted, all surfaces redecked, all forged internals, etc... You won't make much power by doing that on an N/A build, but a similar job while upping the displacement would run around $6200.
You can also buy a new block, but since there is nothing wrong with yours it'd just be extra money. The LSX is an extra 80lbs on the nose of your car and WILL hurt handling, so I couldn't justify it unless you were going for 1000+ horsepower and an aluminum block just couldn't hold the power safely. The LS7 is a nice engine but a lot of money for a few more cubes; your heads will choke power on an engine that big, and for the price difference you could just keep your car stock displacement, go forced induction, and make more power than an LS7 ever could in naturally aspirated trim...

Of course, when you look at how much money you can potentially spend on this, try to think of how much you could sell your car for, add the money you want to spend modding it to that amount, and see what kind of newer Corvette you could buy. A complete swap for an LS7 shortblock will run $10,000+ at most shops (assuming you're not doing the job yourself). 10 thousand dollars into a vehicle with over 100,000 miles will still result in a 100,000 mile+ car that will sell for bannanas in today's market, and you still have a 100,000 mile transmission, differential, wheel bearings, sensors, water pump, air conditioning system, power steering pump, bushings, mounts, seats, etc to contend with... Instead of dumping money you will never see back into a high mileage car I strongly recommend you to look into trading up to a newer vehicle. That's just my 2 cents worth of course; I've thought this one over many times myself since my car is at 65K and I blew my motor; my decision was to rebuild it with forged internals, on a budget, do the work myself, and drive it for another year / year and a half, then sell the car before it gets up to 100K, because in the past my experience with high mileage vehicles has always been that little nagging problems pop up left and right with every single system in the car, and it sucks all the fun out of driving it.

THere are a TON of options! but WE usually do a Forged motor cause we can do that for the same price as a GM short block and you get a better motor out of it.

THere are a TON of options! but WE usually do a Forged motor cause we can do that for the same price as a GM short block and you get a better motor out of it.

:iagree: then you later can stick some nice boost to that motor :thumbsup:

yep! I cannot try to sell you anything, or try to, as i am not a vendor, but im sure there are many vendors on here that can help you out!