ls2 question
650+ rwtq in a LS-series = a lotta $$$
650+ rwtq in small block chevy = a lot less $$$
Off-road? Go big block. Or, go with a tall-deck small block (SBC). Brodix or Dart make excellent blocks to start with.
You will have to decide if you'll run race gas, or pump gas. This decision, along with your HP goals, will help determine your required displacement and compression ratio (C/R).
If there's a reason to go with LS2 (i.e. you have one), there are lots of forced induction options. Do a search on this site for specific information.
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The Best V8 Stories One Small Block at Time
10.9 to 1. We managed to put an intercooled Magnacharger on a LS2, and everything bolted up perfect. It made 560 flywheel hp on our engine dyno with 6lbs of boost. We could take a stock crate motor, order a custom set of pistons from Diamond, get the boost down, and realy throw some boost! Let me know if I can help!!
Here is a pic of what our set up looks like.

