Ya im building a F/I B18a with around 15psi so ill need aftermarket internals.
This is what you need to do....
1) Have a machine shop re-sleeve it and bore the cylinders to the desired bore for the pistons you will be running. When sleeving (which IS expensive), it also includes your other machining such as hot tanking and honing so that will be included.(most machinist's includes it -- roughly 1000 bucks)
2) Get some pistons/rods. I prefer JE/Eagle for pistons/rods. Look to get a compression ratio of around 9:1. That ratio will be perfect for LS.
3)Have the LS head re-done because it flows like ASS. You can have it mildly ported, but even then it will flow, maybe like a stock b16 head, which IS better than the stock LS. Replace valvetrain with stiffer valve springs, dont run oversized valves, just stick to the oem size. Retainers, and keep your stock LS cams they will work fine unless you wanna spend $$ on aftermarket cams like crower or even a custom grind(requires matching valvetrain components). Use arp for ALL your studs/bolts. Change all gaskets with new oem.
4) do a fuel system setup to accomodate your power goal. This all depends on how much power you want to make.
rc 550's, walbro 255lph pump, higher volume fuel rail, FPR and a FP gauge should get you started out and will be sufficient for 15psi.
5) put together a turbo setup. I suggest 50-60 trim turbonetics. Parting it out will be cheaper in the long run, just takes patience.
6) Get an engine management you will need it. With larger injectors, the engine will not even start on the stock ecu let alone run. Do some research on which ems would suit your setup for the price you can afford. Plenty of routes to go here, aem ems, hondata etc. I use crome-pro.
7) get it tuned.
