I enjoyed the other thread was actually a good discussion. I said no, but we all know it would have to be light and attention to detail. But you know that. O and money!!

 

I would say it could be done, maybe. $$. Do you know of the highest HP N/A 346 right now? In my mind, to get that power, you would need to be revving high. Would the plastic intake support it? Many details & questions. Only one way to find out right?

 

9.3 and 148+ without much seat time in a street car setup.

I could idle the car @ 500rpm and start off in 4th from a stop with no throttle.
Drove to the track many times with it too.

I designed the setup and my buddy is indeed an excellent engine builder. MCP Competition Engines

 

We rev it high.

And yes I believe a plastic intake can and has in my last few setups with the stock bottom end. I'll try and copy paste my dyno and post from the other forum so people can see that my power hasn't peaked @ 7250rpms yet with a fast 90.

My plan is to sell my car since I don't have the time and energy to race it as much as it should be raced and someone should be enjoying it and even making money with it.

However if it doesn't sell I'll use these threads as motivation to put on a set of aftermarket heads and show people what can be possible. I certainly wouldn't remove the 4.10's but we can assume that the dyno would read higher with the stock gears. I also have a 20lb clutch in my garage that will et around .08 faster in the quarter mile than my current setup. And there's no way people will allow me to just dyno the car and not take a few passes.

The record needs to be well over 550 or it isn't high enough.

 

I appreciate your opinion and agree it takes a lot of time, research, and $$.
I want to encourage people to challenge themselves and their performance shops if they want a hot rod and are willing to spend the money.

In 2016 we shouldn't be happy with 430 hp from a heads/cam setup.
I don't feel you need to compromise much either.
If you are willing to spend the money and don't mind some cam lope and having to slightly modify your driving style then challenge your performance shop to get you around the 500whp mark. There are parts out there to achieve this but the setup needs to be planned out as a whole project with parts that work together efficiently. You have to trust those guys who have the knowledge and allow them to work their magic.

 

What Ecu would you run? Figured individual cylinder tuning would be a big help. What's the highest you reved a 346 sbe?

 

I have BS3 right now but there are so many better systems out there IMO. I don't recommend it especially because there were many times where I made changes to the tune trackside and it didn't take, and that's a scary concept.
Individual cylinder tuning is neat. I have seen some gains in past setups but you really need to spend the time and break down the data logs in all gears and test, test, test. The one time I actually crunched the numbers with detailed precision is when I saw a nice bump in power.
Again, with BS3 the resolution of change you have the ability to make is not fine enough in many instances. Sometimes you'll see a cylinder going lean in one gear at a certain rpm but is on the rich side in another gear at another rpm, so you really have to break down the data well in order to make conclusions and changes that will work.
I've yet to individual cylinder tune this current cam-only setup but have a nice set of logs to analyze in order to do so. If the manifold isn't super efficient and distributes air unevenly to the cylinders I don't doubt you could pick up 15-20 hp doing this. I've seen some discrepancies as high as 4-5% in some instances.
I put the limiter @ 7600 in competition and have bumped it a few times right after the traps. I was short shifting it around 7100-7200rpms for safety but based on all my calculations the wants to be shifted near 8000 which is just not practical.

Post #90 in this thread http://www.corvetteforum.com/forums/...ossible-5.html
may be helpful for some of the 1/4 mile racers.

 

I assume it had rod bolts? About to rev my sbe cam only plus nitrous deal super Vic and will be reving it!

 

Yeah do rod bolts.

I like racepak for data acquisition FWIW.
I now also try and get the car into neutral after the traps to avoid engine braking at high rpm. Not sure if this helps but it can't hurt.
Try and stay off the limiter too especially with the nitrous and be deliberate with the shifts.
Keep us posted and I'll try and help you out along the way.

 

That is awesome. I will have to check out MCP. Sounds like a setup I would love to have. Amazing to run low nines at almost 150 mph in a streetable small block LS car. That, to me, is insane for N/A power without a big block. What was the raceweight and setup for that combo (car, etc)? Also, what kind of $$ was this setup?

Thanks,

 

That motor has been refreshed, upgraded, and is for sale for 1/2 the price it would take to build.

It's partially assembled now. Email me @ rzgl3@optonline.net if interested.
There's a for sale thread on CF.
The ITB is what makes it so streetable.
Car was around 3100lbs back then.
There's plenty of you tube videos.

 

Here's the link.
http://www.corvetteforum.com/forums/...post1585314473
There's a video in post #14

 

Sounds like you may want to ping Mamo about massaging your heads and intake...if you haven't already considered it.

 

I have great faith in Tony.

If I decide on doing heads I would highly consider:

his MMS 220 heads
or
a Mast ls3 small bore heads with a Mamofied ls3 fast 102 manifold.

My setup now has unported 243 heads.

 

Video doesn't work. Do you not have access to the videos yourself?

 

 

Thanks for the links! Nice setup on that engine. I think I remember seeing that vid years ago (prob 04-05 or so?) It sounds like it is revving to the moon. I have a feeling the valve springs wouldn't last too long revving that high but still very impressive. Please explain more on the ITB setup...links to pics etc.? Just curious as I never hear anyone using that setup.

Onto the original question. I still think 575rwhp with 346ci is not going to be doable with a setup that would live long and without some serious trickery to get the peak number and nothing else. In other words, I think you could hit a number but it would most likely sacrifice everything else in order to hit the number. I think you would be limited by rpms with that size ci but if you used hydraulic lifters that "acted" as solids you could rev it to the 7500+ rpms if would take to hit the 575rwhp number.

You could always hook the engine up to a direct drive fwd type drivetrain so the power is more efficiently transferred to the dyno .

Please post some more detailed links. I am intrigued and want to read more details!

Thanks,

Matt

 

That was no standard diagram clutch in that vid. Soft lok?

 

The 388 in that video was only shifted at 7800 because the stock computer has a hard cutoff around 8100.
I would expect 100 passes like that with the 388. I think you underestimate the potential of a well designed valvetrain. The car was built to handle the rpm but you don't have to spin it that high unless you want to go for a record pass.

The 396 I designed spins to 10K. I 'm more concerned about that setup.


And the 346 cam only setup that makes ~525whp I have now runs great with virtually no maintenance. I barely even check gauges. I don't have to rev it to 7500 ever. It will go faster if I do however.

I'm trying to explain that if I add heads, a ported 102, 3.42 gears and a 20lb clutch, all of which is easy to do, how could the car not make 575whp?
That will also add a full point of compression.
And the car wont be peaky and hit the mark by 7200 rpms.

I'm only 50 hp away now with stock unported 243 heads. The car will then breathe better and probably have better street manners.
That's why I feel strongly because I'm almost there already and the car is simple to drive. But yes, it is setup for drag racing and some of the modifications take away from it's street ability, but that's only because I like to drag race and don't race on the streets.
There's no serious trickery. There are things we do to make the chassis more efficient for the drag strip. I can tell you that I do index plugs and pay attention to harmonics and am obviously aware of parasitic losses.
I can also tell you that on the cam-only dyno pulls we didn't use super lightweight oil, a vacuum pump, stock gears, and individual cylinder tuning, all of which make significantly more hp on the dyno for sure. The lighter rims do help on the dyno however.

There's a lot of info on my setups floating around more so on the CF. I'll try to dig some info up but I'm not one to make or even read built threads so I'm not the best person to find info.

 

Great thread, I am very curious to here about the cam only set up that makes 525whp.