I would not do lsx block because I have read they have various issues and require a lot of machining to use.
At 700 hp I'd debate if you need a block with provisions for 6 bolt cylinder heads. I'd say forged 402-427 short block, TFS or AFR heads, a cam spec'd out by someone who has experience (like PatG on ls1tech), and a supercharger and you're there.
You can also go bigger on displacement and cam, add fast 102 intake and probably get there NA but drivability may suffer.
Realistically you can just throw a turbo or supercharger on any ls engine, even a stock 4.8l and probably make 700hp but for reliability and drivability sake I'd probably not do that.
|