lemons12

iTrader: (71)

What heads and exhaust? I bet you aren't anywhere close to maxed out even with the current cam.

badazz81z28

iTrader: (6)

I have the PRC LS6 Stg II heads, 1-7/8 LTs with true dual 2.5" with dynomax Ultra flow mufflers. FAST 102 intake/FAST 92 TB / 85MM MAF/CAI/36lb injectors.

"MAC"

iTrader: (1)

Read up W2W and see what they did they pretty much have step by step on how to make a 500rwhp+ car and you will learn a lot or you can try and take the lazy way and ask people on here how to do it like i try and do lol.

"MAC"

iTrader: (1)

IS the MAF really needed at all? My tunner tuned it to where I didn't need it. Just wondering if the MAF helps it run better or not. I haven't had any problems what so ever when he tuned the MAF out as well.

badazz81z28

iTrader: (6)

I would imagine the engine would need some form of reference as to how much air is coming in, but I have no idea.

lemons12

iTrader: (71)

Heads are definitely lacking... A set of AFR/TFS heads would be much better.

3" on the true duals... I'm not familiar with ultra flows so I don't know if there is power there.

Port the intake.. Add a 102 TB.

SD tune

There is power left in 98% of setups.

lemons12

iTrader: (71)

Honestly.. I'd rather do a crap top end 408 before pour tons of money into a 346.

It would make roughly the same power with **** tons of torque... Biggest difference... One is fully forged and 408 CI.. And one isn't and is 346 CI.

Always2Slow

iTrader: (8)

Couldn't agree more lemons. I see so many people throw tons of money at small cube setups like a bad habit and ask them what are your goals and what are you doing with the car. Unless your going to break the SBE record why not have a bigger broader torque curve, which matters more on the street than a peaky 346 that cost alot of money.

JakeFusion

iTrader: (7)

Or you run a combo that'll port over to a 402 pretty easily and still keep making power. Just swap the cam (in my case, that's what I plan to do).

Here is a recipe for 500rwhp: https://ls1tech.com/forums/generatio...heads-cam.html

lemons12

iTrader: (71)

It isn't a bad idea..

I'd rather the stroker now though. LOL I'm impatient.

JakeFusion

iTrader: (7)

To do a stroker right, you need to spend money on it as well. Putting Pacesetters, LS6 intake, and whatever heads on there... you see a lot of folks sink pretty decent money into a forged shortblock, run out of cash, and buy a pretty awful topend. Their power isn't any better than a well-sorted heads/cam... neither is their torque.

lemons12

iTrader: (71)

The guy that did my 408 put..

stock fast 90
pacesetter 1 3/4 with a horrible merge and a catback no cutout
patriot 243s... flows 302 cfm

Still was dead even with my 370... 370 was roughly around 455Rwhp/415Rwtq and weighed around 200# less when they ran.

It has also been dead even with a 455Rwhp C5Zo6.


I just installed a 102.. Then I'm doing TFS 235s and 1 7/8 and fixing the merge/adding a cutout.

I'd take a mismatched/cheap top end stroker to a nice 346 any day.

Freefallin

Ok...this is what i understand so far...it IS possible to get 500rwhp from a stock cube LS1 BUT it is going to be challenging and cost a fortune.

You could get way more than 500rwhp by changing the block to something like (as LS6427 said) an LS2 block resleeved to 454. This would also cost you way less.

Is the above conclusion correct?

PREDATOR-Z

Partly.
Bigger cubes cost $$ as well. They just dish out more and possibly more reliably. 427s or 454s need big heads. LS3/L92 are decent but LS7s are better. Then you have to consider drivetrain etc...

ramairetransam

iTrader: (18)

475 ish to 500 , your gonna need all the stuff, awesome heads, huge cam, large lid, larger maf , fast 102 and rails and tb .

JakeFusion

iTrader: (7)

LQ4/9 block is the cheapest way to get big cubes. Anything else is going to really add up... LS3 or LS7 blocks cost a lot. Resleeved LS2s cost even more.

JakeFusion

iTrader: (7)

You just proved my point. The 408 wasn't walking anything despite being a 408. You might have had less money in it compared to the other setups, but that's doubtful as well - compared to a forged 370, it probably wasn't much more expensive, but compared to a stock 346, there is no money in that.

Point is, power and speed cost money. Cutting corners only forces you to buy things more than once, which in the long run, ends up costing a lot more than doing it once and doing it right.

To the OP - buy things that can be portable to a new setup. Buy good heads, not cheap heads that you need to replace later. Buy a good exhaust setup, good intake manifold, etc. Things that will make a 346 shine will also make a 408+ shine as well.

LS1-450

iTrader: (33)

LOL, Pat G posted a complete thread from start to finish on what he did to achieve streetable 500+ RWHP. Engine is only part of it. IDK if he's still on here or maybe the thread trickled off. Seems the archives aren't a deep as they used to be.

He did things like lightweight flywheel, hollow stem valves, head port, intake port, windage, exhaust mods, pulley, TB, degreed cam designed to his grind, high RPM (tune & injectors...obviously) Don't remember if he used a vacuum pump to get negative crank case pressure or not. Pushrods, rockers, lifters etc..

MikeWS6

If this is going to be a street car, power under the curve is where its at. I wouldnt worry as much about peak numbers.

JakeFusion

iTrader: (7)

See post #30 above.