Im just curious with either a 350 383 or 396 with no blower, nitrious can pass 500rwhp because they all seem to be in the 400 range

 

Im just curious to see what has to be done

 

I might be a little off here but basically heads and cam make HP the size of the bottomend under them decides the torque curve. What I am saying is a 400rwhp stock bottom motor will not be as fast or make as much AVERAGE power as a 400rwhp stroker and will make that PEAK number at a higher rpm. The hard rpm limit of our pcm comes into play too.

That said I would live to read what the likes of SStrokerace, Mindgame and a few others have to say about it, I am sure they will have at least some correction for my comments but hopefully I got the ball rolling.

I can think of a solid roller 383, LT1 castings, basic ported LT1 intake, stock engine management, that put down 490 at the wheels through a 4L60E, wouldn't call that normal though.

 

It's all about the induction...

 

Most builds are built with ported stock castings,stock intake and re flashed stock computer. After being modified these are still the limiting factors.

Get a set of heads that will flow 350CFM+ an intake to compliment them and a Fast system ya can go on up in HP. That's about 10 grand need I say more.
Ya can squeeze more out of the stock stuff but that's pricey too.

 

Yeah I would say you need good (read - not stock) heads, fully ported, good compression, quench etc. And once you get up around the 450rwhp range the intake starts to play a bigger factor. Of course I am no veteren, but I do know that next week when I get all my stuff in, I plan on a full dyno tune (just got off the phone with PCMforless). Then I will get a ported/converted super vic from bret and dyno/tune again. I hope that will get me closer to 500rwhp but I don't think I will get there, but maybe 460-475

 

You have to realize how much power that really is too. 500 At the wheels is damn near 600HP at the Crank. And a 600HP NA small-block is one beastly ****ing small block for a street car.

To make 500RWHP at the wheels, you would need a solid roller. And you would definatly be spinning it up to the stock PCMs limit (7,000 RPMs). A set up like this would be very difficult to make streetable. I mean hell, people on here complain about the CC306 and GM847, which would be mild compared to the manners of a cam to make 100 HP more on the same cubes. Also, as said, alot of it is in the heads.

A good set of ported LT1 heads will flow 275-280CFM and have a close-to 200CC intake runner. Start looking at some of the more top end heads though. They outflow (Especially ported) the stockers by quite a bit, and make your wallet a little lighter in the process.

Most people here are content with a low 12 to high 11 all motored street car. And 99% of the cars on here are street cars, not track only. So it only makes sense NOT to build a super aggressive, solid rollered, aftermarket fuel injectioned car. Its just not worth the extra time money and effort. Especially the money, for a street car.

Dont think it cant be done. It jsut cant be done with ported heads, and a hydraulic cam. Nor would it be real friendly to drive on the street. And if your spinning the stock bottom much past 6500RPM's you ARE going to spin bearings, so its not just bolting parts on. You would have to overhaul the entire engine/drivetrain. Its alot easier (And maybe cheaper), and streetable, to go with a milder cam, keep it under 6500ish rpms, and spray on it or something. You get the point.

 

No matter what cube you choose... 350, 355, 383, 396 they will all make about the same HP numbers with the same components, the torque will just be a little more on the stroker motors. If you have enough money to make a 500rwhp N/A motor you might as well just get a supercharger. It would be about the same amount of money and the power is instantanious due to the charger.

Most cars that are NA are street cars, and are very proud to say they have a 400rwhp motor that is daily driven. My little 355 puts down 400+hp and I wouldnt change a thing.

If you want more than 420rwhp get either a turbo or a supercharger. That's the best advice I could give you. NOS is expensive and it is expensive to get a decent setup $1200 with all safety tools. 9 dollars a pound for NOS here, thats 90 bucks a bottle. Not cheap in my book.

 

I'm on the juice and i spent about $600...but then u throw in my tune and im at $1100. Im making the numbers in my sig...but i like to drive it on the street and have it drive easy...i would like to go to something more extreme later by adding heads but as i see it...ive got it if i need it..the juice is pretty much worthless on the street anyways because of traction issues.

 

thanks i was just wondering so its all about the heads huh

 

Wonder if a set of ported Trickflows, Supervic, M6 tranny with a 10 bolt and 383ci can make 500rwhp with an agressive hydraulic? Maybe maybe not, but I'm going to try. Never say never!

 

Curious as to what heads you recommend over the stockers being ported?

 

You would be damn close if you have a good dyno tune on it. If you do it, keep us informed of the project. That would be mean as hell as a street car.

 

You can make a STREET car 500rwhp, but you can't build it like a LT1. You can use a LT1 block and build it around that but no, no to the intake manifold.

I have a motor sitting in the shop waiting to get on the dyno (it has for a bit now) that should do 600+ HP SAE and have a idle like a Hot Cam. It's a hyd roller and is not a RPM queen either.

Part of this deal is efficiency... you need the motor to make big TQ at the midrange and get the HP peak to come in early. I fully expect the HP peak to be at 6200rpm.

So what's it take to do this? It's a combination #1 and #2 the right parts, which leads to #3 Money.

hsyr has a good idea on how to get there... at least that's the basics.

Bret

 

Well, I have a 396 with ported factory heads. These heads flow about 285/220 at .600". It has a custom set of 1-3/4"-1-7/8" stepped headers and a HOGAN'S sheetmetal intake. Compression is 12:1 and cam is 250/260 .630/.637 lift. Tranny is TH400 w/5K converter on T-brake. Believe it or not, the car is nice to drive on the weekends. It's "manner" is not too radical...the loose converter and no overdrive are the only drawbacks.
The setup still retains the stock PCM that I program...so I shift about 7K.
That being said, the car weighs 3600# with driver and ET is 10.94 @ 123. I have not had the car on a chassis dyno, but excepted formulas indicated about 625 flywheel HP.
Currently I have a set of custom ported AFR's that flow in low 300's. These will be my next upgrade. Although the motor likes RPM, I will continue to run the factory PCM and maintain a 7K shift point.
For what it is worth, This car started out as a stock bottom end LT1 with the same ported factory heads mentioned above. Cam was a solid roller 236/242 .605/.603 lift. It made 426RWHP...about 7-8 years ago. Later I built a 383 with all the same components. This combo made 440RWHP. Both of those were with a stock LT1 intake. I feel quite certain the new combo makes over 500RWHP. I would estimate 525-530RWHP with the 396. As mention I plan to swap heads and make a little more