Hey im wanting to to build a LQ9 all motor pump gas to have around 700hp at the crank and beable to withstand a 200 direct port shot. Does anyone know if im pissin up a rope or is this pretty doable? i do have a budget im trying to stay with the L92 heads and lq9 block but im open for any info you guys may have to help..

 

http://www.youtube.com/watch?v=VL9qZ...eature=related

Stock cubes? Nu uh. This 427 barely made 700 with some major work done. 600hp is much more realistic, and since the LQ9 is iron, with all the right components, I see no problem with a 200 Shot. Just be careful!

 

damn lol i was hoping to hear differently but i kinda figured something along those lines i keep hearing 600 is what i will pry be looking at. thanks

 

Honestly 700hp is doable but your going to have little torque since to attain it you are looking at running super light components to meet your goals, and you'll lose your ability to get away with a shot of happy juice.

 

Stock cubes? Pissin up a rope....

 

Can it be done - probably. Should it be done - probably not.

700 hp is getting pretty close to 2 hp per cubic inch - tall order on anything driven on the roads without FI. This will take a lot of rpms as noted above requiring great heads, very light and expensive rotating parts and solid roller valve train. There are likely much less expensive ways to get to 700 fwhp.

 

I have one for sale that should have no problems making 700 at the crank... but it's not going to do it on pump gas... it's for sale for 9500, and you can't duplicate it for less then 17 grand fwiw.

With pump fuel, I think you would be lucky with 600 and have it still be happy, at the crank. (this is a 408 ci motor we're talking about, bigger I am more then aware can make more)

If you want to hit it with nitrous too... better plan on losing 40 hp too in an effort to use parts that will take the abuse, and looser ring gaps and whatnot..

So... that all being said no you're not going to get a 408 to stay together at 700 hp n/a and be able to take a 200 shot, and run it on pump gas. Lower your expectations 150 hp, or just cave and run race gas.. that's pretty much your options if you are committed to a 408 iron based engine.

 

A properly built lq9 with all supporting bolt ons,aggressive cam,hi flowing heads and intake and high scr has the capacity to make 600+ bhp or around 480-500rw depends on transmission and rear end used.
Idk bout no 700 though
Sounds like a tall order

 

14.5 to 1 compression, the old et 4 inch bore ls7 heads that have been hand finished a little bit in the bowl's, solid roller with 260's duration and the right intake, a vacuum pump and a good set of headers....


Not at the tires... tires I wouldn't expect to see 600. Probably 580 to 590, 600 would be a tall order.

It's sitting here right now... if it doesn't make south of 575 rw there's something seriously wrong. My old 402 with a substantially heavier rotating assy, hyd cam in the mid 240's for duration, heads that flowed nearly 60 cfm less and a fast 90 untouched intake, 13 to 1 comp. with a stock f body maf on it rade 480...

Believe me, this will make a good 100 more at the tires thru a th400.. figure a 18% loss, that's 696.x hp... right about 700. It can be done. More then 700? I dunno, I have enough room for a little more camshaft (.140 intake and .180 exhaust clearnace), a slightly thinner gasket then the .045, say a .040 to kick the compression to just a touch under 15 to 1, and a touch more cam.. it might, but it's going to be really cranky like that.

 

600 horse I'm going to say is the magic potato.

Especially to survive the abuse of N2O bro.

 

For the OP, I agree 100%. For a 408 engine to survive with 200 hp of nitrous to it... if it's making a whole lot more then 600 n/a crank hp, it's not going to do it with pump fuel. I don't even think 600 crank hp will happen with pump gas, and if it does, the motor's certainly not going to have parts in it that will take nitrous use.

Ditch the pump gas and you open up alot more possibility..... on pump fuel, it's not going to happen.

 

I am not saying its easy but if you don't care about drivability and can run a carb style manifold you can probably make 700hp with the right parts by extending the engine rpm.

 

A LS3 414 can make 700+ at the flywheel on pump gas. Just gonna hafta turn some rpm to do so Mine has only 11.2:1 compression with a set of L92's and a GMPP intake. It made well over 700 on motor and just a tick over 1000 with the direct port.

 

These are much more easily achievable and realistic, but again stock cubes just ain't gonna get it.

 

Hmmm... thats 1.69hp+ per cube, thats a big ask for L92s,11.2 comp on pump fuel. How much is "well over" 700 ? Was this on an engine dyno or a guesstimate? Just curious.

 

Engine dyno. Made 730+ Cam is 255/265 .700lift and 110 lsa This was with a 4150 style carb on top. Im using a 4barrel tb. Hope to have some chassis numbers soon. hoping for over 600 at the wheels through the 6 speed.

 

 

My 408 has a 262/267 730 lift solid roller cam in it, and I will put a single plane and an sv1 carb on it if I end up using it... 4500 style carb. I am also at 14.5 to 1 compression....

I'm sure it will be in the 700+ range, heads are 4 inch bore ls7 heads as well, which should make more power then he l92 ones do..

 

I don't think that motor would have a problem making close to 800!

 

I don't want to get my hopes up. It's for sale, and I can't believe it's still sitting here... brand new never fired, and noone wants it. Nuts.