Naturually aspirated, streetable, small block. Does 600-650 horsepower sound possible? I have seen 427 lsx engines for sale with that kind of power, and claimed to be streetable.

Someday I would like to build a fuel injected engine for my 86, the drive train and everything else would be planned later.

I would love to have a bad *** weekend hot rod that I would take to the track every once in a while.

 

not sure of the HP, my concern is ET. but I run mine on the street all the time. What fun is it to have a vette & not be able to run it on the street???

 

Streetable means a lot of different things to different people. IMO it means it will pass both safety and emissions inspections. It will not overheat and is fairly reliable. With that in mind, it would take a blower or nitrous to make 600-650 hp out of a small block chevy and even with that it aint going to be easy or cheap.

 

Don't compare to LSx engines; they can have more power and still be mild.
Realisticaly I would say 5-600hp NA on a big inch SBC.

SBC's have a big range, how many CI are you talking about?

 

should not be a problem, assuming you are talking crank HP

 

max streetable? - a very vague question - you must first define streetability and then we can tell you what to expect...

But since you asked, i'll see if i can post a shot here...

this is a motor i have in mind. stock block 414 stroker (4.060 bore with a 4" stroke, 6" rods, custom pistons) using relatively mid-grade off the shelf aluminum heads an a custom comp cams grind, dual plane intake, and an 800cfm carb. motor is 11.48:1 compression and should run fine on pump gas.



looking at the graph you'll notice 2 things...***** of torque, and it is everywhere. for a SBC that is an extremely flat curve within its intended range of < 6000rpm. 500ft/lbs from under 2000 till a hair after 5000rpm with peak HP in at 5500. should be ~500hp and ~535ft/lbs torque...with the relatively short durations and LSA i selected idle should be very good and there is little overlap (some, but not much).

going with fuel injection on the build wouldnt be too hard. a modified TPI would supply enough air, but i'd say a super-ram would be perferable due to the extra midrange increases it provides.

that...should be one hell of a "streetable" motor that will still shred tires whenever you want...oh and it'll be forged so you can add 150 or so extra hp if you're still not happy

 

cplonner...think 3.875" or 4" crank and real good heads. The bigger the motor, the more streetable it can be and still make the big numbers. Power adders are another way to high HP( supercharger or nos).

Fubar569...I don't think I would go .060 over on a later SBC block, and I don't think 11.48 compression would be too pump gas friendly, unless you ran a very big cam, especially with a Carb.

 

The block is getting a 1/2 fill prior to any machine work. .060 should be fine for a one-time-use motor.

i also still have access to 93 (and in some cases 94) octane at the pump at every station here, so i can go a little higher than the average person out in great communist state of kalifornia. it might be a 'hair" high, but i can play with other things to bring it down to 11:1 just incase. it should still make almost 500hp and 525ft/lbs even at 11:1...11:1 on 93/94 should be doable...

as far as running a huge cam...that would move my power range way away from where it is right now. now going fuel injected would allow me some good tuning options and 11:1 or a bit more on 93/94 becomes quite liveable. This is something i'll have to consider...

 

Ok as far a streetable car I would mean that it doesnt over heat or stall at a traffic light. I live in florida where we do not get emissions tests. I would like the car to be in the 10 second quarter mile range with this type of power. I was thinking a stroked small block, 383-427.
I would be looking at a miniram intake problably. And this would be a project, so I would throw money at it in increments but I would have a main plan and stick to it. This wont be doable for a little while, but I would like to have an idea at some point.

 

Take a look at some of the worked Z06 engines; are any making over 600chp??

 

Corkvette,ski-dwn-it, and some others here are in the 10s. I know ski has a site describing his build.Check it out and see what it takes to get there.

 

definitely take the time to chat it up with these guys. they really know thier stuff. i had a chance to meet ski personally at the "dragstrip" in st. marys where he's located and he's a really stand up guy with a freakin unbelievable ride

 

I've got a Golen 396 LT4 making 520 crank hp thats very streetable.

 

Hoover, a 10 second naturally aspirated LT1 Corvette
http://www.ideasandsolutions.biz/Hoover/top.html


Diabolical Dave's 427sb
http://diabolicalperformance.com/Dia...alvette90.html

 

Yes, a 381 LS1 with a moderate solid roller (230/240ish @ .050) with AFR heads can get over 600 (this one was 610) and be plenty driveable, Ive ridden in one. F'n awesome!

Belongs to a member here.


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I'm around 550 crank hp. It'll sit in traffic and not overheat, but it probably won't pass the sniffer. Gonna take some $$ though. BlueWasp here on the forum just finished a 383 LT4 with 440+ rwhp. In my book, it's an awesome set up.

 

There are some nice examples of this sorta power running around.....while some thinks its impossible to accomplish and still keep them streetable; its really not that difficult with the components nowdays.

Its all in the heads and intake: AIR - the rest is pretty simple. Even the stuff we have is not that extravagent its just very well matched to the other components that are in the motor.

I would have no problem with sending my wife across town thru traffic etc with my car; other than the fact her driving skills SUCK - but that is not due to the power; she just downright scares me!

Now the power we are making with these cars is almost too much for the street in terms of usable power. I can cruise the street/roads around here at 70MPH and your barely touching the gas peddle. When you start getting into it, its very easy for the car to get way way loose even at high speeds (50-80mph). This makes you wake up real quick when you feel the rear of the car starting to come around at those speeds!

So I would not highly recommend a build such as this for a strictly street type car; as 50% of the power would seldom be tapped into. Now my car is a dual purpose ride...I still like to take cruises in it and rattle the neighborhoods I pass thru; but also race it on the weekends in bracket competition - which is where you can really appreciate the power and make some big block all out racecars scratch their heads! This year after the solid rear; she might get a little frosty added to her for added insult

It can be done and its not exactly cheap and other things like rear components need to be considered once you really start crankin power. But it can be done successfully with the right pieces back there too. I have been running mine for ~5years with <11sec passes and only had a handful of failures, with hundreds of passes down the strip. I am looking for a new challenge this year so I opted to go with a solid rear!

 

Im figuring having a stroked motor that makes power in the 500 range would sound most reasonable after what ski said. Golen engine service said they could set me up with a 383 with enough cam to get me in the 500 range with a decent idle. Im not sure how much that would cost though becuase everything on that engine would be forged. I will definately be taking this car to the track and to weekend car shows when it is finished, this wont be for a little while though. But I do have my heart set on it.

If anyone has anymore pictures of engines like diabolical dave's or hoover's car, I would be more than happy to see em! Those are some amazing cars!