they have plenty SVT lightnings making 700-1100 hp on forged 330ci stock blocks...
i would think the ls style motors would do it easier... ther are was better and make more power per ci...imo

 

Its gonna take forged internals and a forged crank if you care about having it last a few years. If you are going to do all that, why not pick up an iron 6.0L block for $500 and do it right?

Plus you are going to be pushing at least 18-20psi -- most likely 22 or so. You will need a fuel system to support that -- so a low-impedence injector driver, some huge injectors, twin fuel pumps, bigger fuel rails and lines, etc.

Once you are done, convert to a 4L80E and have it built, find a stall that will work, build a 12 or 14 bolt rear end.

Then you can start on the rear suspension so it will do more than start a smoke show

 

sorta on same topic, what is the highest hp 5.3 anybodys herd of, just curious..

 

This is the highest stock block 5.3l I've ran into. Look at the 2nd set of dyno numbers about halfway down the page. 821 RWtorque and 849 RWHP through a 4L80e.

https://www.performancetrucks.net/fo...=399761&page=5

Rick

 

thats pretty close to 950, but i imagine its pretty much maxed out. old numbers were with 17psi, and new numbers just said high boost run. so thats gotta be 20+. but id imagine there are more reliable ways to get big hp numbers. still cool to see a little 5.3 with those numbers.

 

aint no way. you are going to have to weld the heads to the block to hold the amount of pressure it will take to hit 950hp.

gonna need 30psi+ plus some nitrous most likely.

 

Only 18 psi. This kit is on Rick's DD so he keeps it turned down to 14 lbs for everyday use. His wife drives the truck to their shop everyday and I know this longblock had about 5k miles on it with the 17lb kit (also turned down to 14lbs for everyday use). I bought the original kit over a year ago from him so I wouldn't be surprised if the longblock had another 4-5k miles on it.

The longivity is a testimate to how important the tune is when you start playing Dyno Queen...

Rick

 

Forgot to mention. This is with stock 317 heads, a set of dual springs and a custom Synergy Turbo cam in the 226/226 ballpark. The rest of the longblock in bone stock.

Rick

 

i agree tune has alot to do with reliability. but that still seems like a bunch of hp for a stock cubic inch 5.3, intake stock? and with 850@18psi i think 950 could be reached with a little more stretching.. then get some forged stuff made and go to town

 

950hp crank is what im after, so that equals around 800rwhp. I'm not a high school kid and have built a turbo lt1, but am new to the lm7s.