Build 346 or go bigger cubes....
On The Tree
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415 shortblock from Schwanke, forged internals, dished pistons, milled heads (ls6 ported or l92), fast 90/90, big cam, 11.5:1 compression. 500-550WHP N/A and then throw a 100 shot on there if you aren't satisfied.
Shortblock 3300
Heads 1000
Intake/TB 1000
Cam Kit 600
Gasket Kit 150
Head Bolts 150
Misc 500
Total 6700
Probably off, but as you can see stuff gets expensive.
You may get away with just l92 stock heads and a l72 intake (no idea what kind of power people are making with this setup). I would work with the engine builder and cam designer and try and get that compression ratio up while still being able to use a good sized cam (Pat G, Predator, etc).
Shortblock 3300
Heads 1000
Intake/TB 1000
Cam Kit 600
Gasket Kit 150
Head Bolts 150
Misc 500
Total 6700
Probably off, but as you can see stuff gets expensive.
You may get away with just l92 stock heads and a l72 intake (no idea what kind of power people are making with this setup). I would work with the engine builder and cam designer and try and get that compression ratio up while still being able to use a good sized cam (Pat G, Predator, etc).
im probably going to get flamed for what i have to say but here goes. Unless u have big funds, build a 347 or a 370. Everyone hypes up more cubes but it is not always the better route to go. Lets say u only have money for a scat rotating assembly setup..... great parts yes. But they are not gonna cut it in a 4 inch stroke type setup. You are going to loose a lot of rpm sticking with forged heavy rotating weight. Im a big fan of reving because reving is what ultimately gets u going faster. If you have the money for things such as lightweight billet oliver rods, callies crank, etc.... then go bigger cubes but im willing to bet u dont have those funds. I have seen many a case where a H/C 347 in the same race weight car runs a H/C 402 setup and the 402 looses. 402 makes more power yes. But the rpm is what hinders it. If he had a lightweight setup in the 402 it would be a different story. My car is a cam only 347 and it makes peak hp at 6800 with only an ms4 cam. I rev it out to around 7100. A 4 inch stroke motor with heavy parts is not gonna like turning rpm that high. At least not the way a 347 or a 370 would. Anyway thats my o2. Thats why i built a 347. Flame on
theres a guy on here that has my favorite setup on this site. he is arabic and has a white TA. i think he lives in kuwait or something? he has an ls3 i believe with tfs 235's he's making 450 rwtq from 2800rpm and never goes below until around 6700rpm i believe. and the scary thing is, is that it has timing pulled for a 200 hit! he has a bunch of video's racing ls7 z06's,lambos,viper's,etc and he's just eating them up without the laughing gas
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i would do an ls3 418 if your staying under 1000rwhp. hell through a girdle on there for extra protection if you really wanted too. stay under a 200 hit for insurance purposes. i think the setup is about 10k w/ out nitrous but you already got that. you could also sell your stuff to recoop a lil. one day ill have the setup listed above unless ls7 drops a little do to something better.but i doubt since gm is not focusing mainly on performance right now and the next few yrs. an ls3 with all the best parts can net 575rwhp,525rwtq n/a from what ive seen on the forums.
your drivetrain loss obviously will determine numbers
.i would do an ls3 418 if your staying under 1000rwhp. hell through a girdle on there for extra protection if you really wanted too. stay under a 200 hit for insurance purposes. i think the setup is about 10k w/ out nitrous but you already got that. you could also sell your stuff to recoop a lil. one day ill have the setup listed above unless ls7 drops a little do to something better.but i doubt since gm is not focusing mainly on performance right now and the next few yrs. an ls3 with all the best parts can net 575rwhp,525rwtq n/a from what ive seen on the forums.
your drivetrain loss obviously will determine numbers i will likely just build a forged 347 on my car...cheapest way because you already have the block, and you will only really need to have the crank polished, new bearings, diff rods and pistons, rod bolts, etc...now you have a bulletproof bottom end and can pour the juice in to make up for the lesser cubes...a nitrous jet is a lot cheaper then a 408 stoker setup...
Thread Starter
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From: Rock Hill, South Carolina
ive seen cars on here with stock bottom end (stock pistons, rods, crank) and a nice cam, good bolt ons, good heads, and good intake and tb go over 520 to the wheels so yes it is possible
Yes 500 is possible but putting that money into a bigger bottom end is a better way to achieve it. Why put a $4500 top end on a factory bottom end that will have a good potential for failure when you start spinning it to the moon to make 500 at the rear wheels.
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i say for the most budget minded build buy a motor that you can reuse the majority of your parts such as heads and cam asuming they are aftermarket buy a lq4 or lq9 shortblock no its not 400 plus cubes but its very budget and will get you more power and back on the road with less coin
i will likely just build a forged 347 on my car...cheapest way because you already have the block, and you will only really need to have the crank polished, new bearings, diff rods and pistons, rod bolts, etc...now you have a bulletproof bottom end and can pour the juice in to make up for the lesser cubes...a nitrous jet is a lot cheaper then a 408 stoker setup...
i will likely just build a forged 347 on my car...cheapest way because you already have the block, and you will only really need to have the crank polished, new bearings, diff rods and pistons, rod bolts, etc...now you have a bulletproof bottom end and can pour the juice in to make up for the lesser cubes...a nitrous jet is a lot cheaper then a 408 stoker setup...
We just sold a 347 for $3300 our 408 is only $4474, so your not that far away when it comes right down to it. But if your budget is only $3000 then thats all you have to work with. Your Ls1 stuff will swap over the the 408.
Also by the time you get done with a proper nitrous setup your at about the same costs. Then you have the constant nitrous shuffle to keep the tank full and up to pressure. So there are pro's and cons to it all.
I was in a similar situation, I decided to go with forged rods and pistons with a factory crank, it will make in the 460rwhp range if not a bit more and can handle a 200 shot with ease. I would not build a full forged 346 with a forged crank, id just step up and build a larger cube motor.
exactly people go iron just to save a few hundred dollars, but I would rather save the weight and spend the extra money and go aluminum block.
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Nice info here; I will be reviewing this in the future for my rebuild.
While I am here though.... I will be focusing on a street twin turbo build for my setup. I will be hoping for 7xx - CHP. This will be running through a convertible T/A M6.
DM
Nice info here; I will be reviewing this in the future for my rebuild.
While I am here though.... I will be focusing on a street twin turbo build for my setup. I will be hoping for 7xx - CHP. This will be running through a convertible T/A M6.
DM
Last edited by Devils Mentor; May 17, 2009 at 01:05 PM.
My buddy last fall had a 408 built for 6000 grand that made 640 hp on an engine dyno. The engine is also built for a 200 shot if he ever chooses to spray it. Check into local reputable shops in your area. Not saying shops on here cant build a nice engine, but ive found that local shops around me that have been building race engines for 40 plus years are very reasonably priced and if something ever was to go wrong with there work, its not as much of a hassle to get things resolved. If it were me and i want looking to go nuts with it, id do a forged ls3 bottom end and a decent set of heads, with a fast 90/90, should make good power and if you have the juice just hit with a 200 shot and rape ****.
TECH Fanatic
Joined: Nov 2004
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From: Tuscaloosa, AL.
It is possible, but you will not have any low end power and you will lose all driveability on the street.
You will need to run a monster cam (flycut pistons), and rev to the moon.
Now, I have a considerable amount of $$ in my top end setup ($5,000++) Look at my Sig.... 450rwhp, with a great torque curve. Here is the graph
Now, I have an excellent top end and there is probably a few ponys left in the tune (in fact, I had it re-tuned and picked up 12rwhp... but it was a different dyno so who knows?).
Now, take the same $$$ that I have in my top end and stick on a 402/408/418..... (say TFS 235s or AFR 225s, ext. ext.) And your looking at 550rwhp NA with alot more torque and the same driveability.
Go bigger cubes, you wont regret it. And don't go with the cheapest shortblock you can find. Figure out which engine builder you want to use and then talk to him about your setup. cheaper is not always better when you are talking shortblocks. 99blancoss has a great reputation as do other sponsers.
