whitehooptie

500 to the ground on a .030 LT1.......... Smells like a drunk hooker after a gang bang that hasn't bathed in a few months.

SS RRR

I have a 395.3. Not as cool as a 396.

96capricemgr

Loomk at AI's page Rick's car a 383 makes 520rwhp through an 8" ATI and 9" axle 11.7:1 static, admittedly a race car, if you use a weight/mph calculator it is over 600rwhp.
Alek's recently posted something about finding more power in more tuning on his already 490rwhp STD 355 this one through a 6 speed and on pump gas. Someone on LS1 tech said they saw it run 10.8 saturday and complained only the first 30 feet of the track were prepped. I don't know what the weight on that is so I can not calculate power based on performance.
http://ls1tech.com/forums/showpost.p...3&postcount=22
http://ls1tech.com/forums/showpost.p...28&postcount=6

They have a customer with an Impala that ran 10.8 at 124 with a self built 383 and again their 200cc heads 3855lbs in september, know it dyno'd something like 480 again 8" ATI converter and the mph/weight says 499rwhp.

The results are out there, they are just not being put down by the guys you want them to be so they are ignored.

The OP has a M6 car and seeing as Alek's is so close to this number with a 355 I think if every last thing is done right the 500 number is achievable. I however do not think a 396 is the way to go, no need to go to that stroke it only complicates turning the necessary rpms and you will have to turn it up near 7K. If you look at the dyno slips for Alek's car it makes torque, 385tq SAE at 3500rpms 418 at 5K, add about 10 for the STD numbers often quoted.

I know some of you hate when I post positive stuff about AI but instead of arguing or hating why don't you post up examples of 480+rwhp NA LT1s, I posted 3 here all on stock pcms. There are certainly others but you will find much more money unnecessarily sunk into afterkarket casting and/or engine management as a rule anyway.

SS MPSTR

Why on earth would anyone want to listen to folks who actually have hard running cars? Or talk to the people who are a huge part of the equation for such cars? Blasphemy!

SS MPSTR

it thaw out enough yet to go back out to the frigid garage to work on your car?

Javier97Z28

Failboat has arrived.

Z-RATED94

That's cause it's cold out. Once it warms up, it will expand and go back to a 396. Oh wait, you live in one of those warm states, my bad. It was 4 below here Sat. and Sun., minus 29, with the wind. I gotta move.
To the OP, why not save some money, stick with the 383, and just improve upon it?

quickSS

355ci LT1's are cool and can rev higher than similar head/cam 383/396 LT1s but more torque is only a crankshaft away and that is not a LOT of money. You cannot build a 355 for cheaper than a 383/396 unless you keep the stock crankshaft. A stroker is not for everyone Dwayne and likewise a 355 is not for everyone.

To the original poster, there are some neat 396 combos that I've seen are are strong performers natural or with power adder:
LINK

Some neat 383 combos:
link

and the 9.8 Abare 383
Link
I watched Alek tune that motor on the engine dyno and it's a monster at well over 600 crank horsepower.

So, with the right cam and good heads you should be able to get your 500 rwhp, (and if you tune it well). The strokers will out torque the 350/355 motors but that doesn't mean the car will get to the finish line first. The best car tuner will get to the finish line first.

96capricemgr

I did not mean the rotating assembly was cheaper I meant the combinations. Lots of guys swear you have to spend thousands extra on aftermarket castings, distributor, dampers, oiling etc, when the stock parts are proven to work at least as well.

SS RRR

It was in the low 70's on Saturday. Replaced an axle on my sick fwd beater whip. Was planning on working on the turd Sunday. Lo and behold it was in the 20's w/ a wind chill in the teens. WTF, mate?

speed_demon24

Don't you know that all these wanna-be's know more than the people who have actually built cars? It's a shame that we are all talking out of our asses with our "experience".

slomarao

i think your going to have a hard time hitting 500rwhp with some type of budget. A lot of AI's cars are doing 430-450rwhp but at that point a few more horsepower is hard to come by.
I think your going to need their 200cc heads, big cam (roller or solid), a monoblade and a lt4 or converted intake.
If it were me i would build a 383, you get the extra torque over a 355 without coming too close to water. I just dont think the extra 13 cubes will make that much of difference. good luck

96capricemgr

Internally a LT4 intake has zero benefit over a LT1 intake.

I agree it would take everything being 100% and most guys wont get there. Carefully following those who have done it is the cheapest and surest way to have a shot though.

FastZ8

well thanks for insight guys good to hear there is lots of good combos but im still going 396 regardless of what i hear and im going to hit the rwhp mark. ive got a really good tuner on hand and i think with the right setup he will get it right where i want it.

whitehooptie

I think the only real issues a good built one would have would be that the rings would wear a little quicker. Or go with a .060 over and get a 401!