Has anyone achieved 400 rwhp from a 350? I was at the Ls1tech board and it seems like the ls1 can get those number with just boltons and a simple cam swap. Has anyone on this board done it without nitrous or other power adders. If so could you post your mods, thanks.

 

Of course.

People who race them have been getting FAR more than that for years and years.

11:1 compression, a cam with solid lifters and about 250° @ .050", and heads that flow 275 cfm on the intake, will get you there. With good exhaust, intake, and carb, of course. Piece of cake.

 

400 can be achieved with just one "bolt-on" Forced induction

 

Right on with sofa,

Yes, it is VERY possible to get 400 rwhp with a 350. With the right selection of parts, you can have it for not too much money at all. You can also go the route of the 411 PCM and harness from an Express Van, so you can have your cake and eat it too (gas mileage and driveability wise). You could go forced induction, but that's going to cost more.

 

I should have specified that I want it to be driveable on the street. I dont want to have to rev it to 7000 rpm to get the 400 rwhp. I think a 250 degree cam at .050 is not really streetable IMO.

 

Here ya go... stickied on the TPI board. Supposed to be very street-friendly, too.

https://www.thirdgen.org/forums/tpi/...-tpi-dyno.html

 

Yea, but that 11:1 motor requires you to mix your own gas to drive it

That result on the TPI board is flat out amazing. Borderline unbelieveable (especially as it's TPI). I have no reason to mistrust him, but man those numbers are high. I don't think anyone else has matched them before.

 

You need to read through the whole post. 370rwhp may be more like it this time around with one little mod and the dyno tune. We shall see later in the year about how close we get to 400rwhp. Hehehe.

PS: IMHO if this car had a manual transmission the 400rwhp would be achievable with no problem. We would be about there already.

 

course its possible but you better have a deep cheque book
not to mention if youre rebuilding the bottom end throw a 400 crank in there and youll have a 383, in which case 500 rwhp is very possible

Some heads that'll get you there

Afr 180 or 195 cc's (180's are more streetable for a 350, 195's a little more designed for a 383)

the brodix IK200cc heads, 568 engine horsepower at 6000 rpms, 542 ft-lb at 4700 rpm
go with the IK180 for a little bit lower powerband if you should so choose
http://brodix.com/heads/tonydyno.html

Trick flow makes some awesome heads

400 hp N/A is nothing new out of a 350

 

what are u making with ur current combo? I noticed ur sig..
"1992 ILE Camaro 190 AFR Heads, Stealth Intake, LT4 Hot Cam, Holley 650 DP, LT, MSD 6AL, Tremec T3550, Moser 12 bolt 3.73" with proper tuning and free flowing exhaust I'd think u'd be pretty close if not there already.. I'm assuming thats a 350 correct?

 

I dont know thats why I started this post. I bought this car from a guy in Oklahoma and drove it back to NE. After I got it back I didnt feel the tune was correct. It originally had a miniram on it. I feel more comfortable tuning a carb so I sold the fuel injection and bought a holley. It also had an oil leak so I pulled the motor out and upon futher inspection I noticed that the spark plugs only had .5 inch of reach and the AFR heads required plugs with .75 inch reach. That explained all the timing the motor liked. After I discovered that I decided to replace all the gaskets and make sure everything else on the motor looked good.

I havnt run the motor with the carb so I dont know what kind of power I should expect. I think it will depend on the condition of the motor. The guy I bought the motor from said that the previous owner re-built the engine with forged rods and pistons. Before I tore it down I ran a compression test and the compression was only around 155. But the motor was not warm and the plugs in it were the wrong size. I think that the combination of forged pistons and it being cold was the reason for the poor compression test.

As soon as I get it put back togather I am taking it to the dyno.

 

its quite streetable, let me tell you.. 260* @.050" right here.. but i did need a vacuum pump for the brakes.. thats it.. i can drive her everyday but i choose not to.. thats what a daily driver is for..

 

With a cam that big what is the power band of your 350, 3500 rpm - 7000 rpm?

 

3000-7000 but i only wind up to 6500.. and the 385 stroker provides the grunt down below the cam range..

 

Do you have any Dyno numbers with that combo or track times?

 

i dont have any dyno numbers or any good solid times.. i know its less than 400rwhp.. i only could manage a 12.41 @ 110.. shifting at 6200, hard shifting from clutch problems and crappy tirespin happy 1.810 60ft.. all with a crap tune.. it should be around 350rwhp right now.. after a tune and after i get it to hook up, i should be looking at mid 11's.. thats still only around 380-390ish rwhp and this is very streetable.. as it sits, i'm running quite rich down low and still puts up good lowend.. i'll be getting dyno numbers in either june or july.. maybe even august..

if i get the new ProSystems carb i've been looking at, i should break the 400rwhp barrier..

 

Sorry but I laughed when I read this topic. Kids today.

 

If it is so easy to make 400rwhp then post the combo along with track times and/or dyno numbers. So far all I have gotten from this post is that if I put a huge cam (with good flowing heads) I will hit those numbers but no one here has any dyno numbers and/or track times to back this claim up. Other than the guy who made 400rwhp with a TPI, has anyone made 400 rwhp and can back it up with numbers.

Listen, I know that a bigger cam will make more power but I want the specific combo so I can duplicate those numbers. Ultimately what I want to know is can I make that kind of power at 6500 rpm or would I have to build a motor that can wind up to 7000 rpm. Telling me that it can be done is fine, but it doesnt help me duplicate it.

 

Why don't you head over to the drag racing board and check with those guys? I remember reading signatures that showed in that power range (or timeslips to prove about that power range).

xpndbl3 might be able to rattle off a few typical combo's he's seen. I think he had a very hot 350 once upon a time.

Evilcartman is doing pretty good with his combo.

bluebeast is doing pretty well.

IHI (but his is a 383, same parts in a 350 would do pretty good).

etc etc.

 

Oh, why didn't you say so. Here's a streetable 9.5 C/R 355 combo that makes 430 hp at 5000 rpm. That should be right at 400 to the wheels. Engine:355 carb:Holley 750 double pumper Heads:Air Flow Research 190cc Street Intake:Air Flow Research FloPower RPM Cam:Comp Cams 270° Magnum hydraulic 224/224°@.050 lift=0.470/0.470 Headers:1 5/8 in. Ignition:MSD 34° C/R:9.5:1 HP:430 @ 5000 Torque:435 @ 3800 Documentation:Air Flow Research website.
Now, go out and build it and don't whine "but it's too expensive".

 

hahaha. I'm constantly amazed by the new gen small blocks... my LS1 has dynoed at 449rwhp/418rwtq at around 6500rpm. 11.30et. Stock block and bottom end, but we're talking headers magnaflow (single) exhaust, heads, push rods, lifters, cam, underdrive pulleys, 1000+cfm tb, slp air box, rebuilt 4L60E, and extensive tuning..... all from a stout little 346c.i.