I can write a book about the pros and cons of ITB on a vette or fbody ls platform because I spent years researching and testing extensively. lol
And there are full threads dedicated to it but I can tell you they allow you to run a nice size cam and maintain driveability. They need to be tuned well both manually and electronically and have several inherent drawbacks that need to be corrected in order to unleash their full potential. Ideally they should place in engine bays with more space and cold air infiltration. And filtration for the street is an issue unless you don't mind losing 80hp as a dd.

 

It's for sale and hanging in my garage for the past 6 months. lol Previously its been out on the street and strip and there's plenty of videos. I'm a drag racer and do race for money so there's some stuff I'll keep to myself. In fact a few of the fellas interested in buying the car asked me to do so also. Many savvy people can read between the lines and gain a great deal of info as I try to do often.

Call it what you want, it's an ls6 with unported 243 heads setup for the drag strip. It's a blast to drive, hopefully someone will race it and make money with it.
I'd rather sell it but if I don't this thread motivate me. The problem is I don't care much for dyno numbers but rather figure out ways to make more power and aplly it to the track.

 

I'm proud of the fact that in the video the car seems like it's just another heads/cam car prior to the pass but embarrassed that I left traction control on for the burnout. lol

 

So that's what happened lol. Awesome run!

As it sits it seems you pretty much know the answer. That's what it looks like to me anyway lol. Great stuff. Someone started a thread about what gets you down the track. Great explanation in post #90 of that thread on CF.

 

Funny how people are talking about some guy doing something with "stock cubes" or this or that aftermarket, when the post clearly states stock bottom end...

Good luck having enough lift, enough compression and enough power on a STOCK bottom end to make 575rwhp...

 

The fact that you're on stock 243s tells me you have a shot at this given your plan. Some Mamofied heads you mention and the Mamofied 102 along with the other details you mention and I think you're flirting with your goal, hard. It's clearly now close to optimized as a package for your 243s. I would wonder if a cam change might be in order with the extra flow you'll be getting through the top end. Every time I've seen someone slap good heads on a cammed motor, they've picked up power but when you push the envelope sometimes the goalposts move a bit on you.

Your ability to rev this thing to 7500+ if you so choose also makes this do-able I think. A factory redline of 6500, would never happen on NA stock cubes.

 

I'd love to know the combination to 500 rwhp cam only.

 

American Racing headers
Custom cam
Fast 90/90
4.10 gears
M6
Vararam
Comp lifters
Stock rockers w/trunion upgrade
Custom shorty exhaust

 

When I get back home to Ft. Lauderdale I look this guy up that always shows up at the car meets. He has a stock cube H/C car with 550 RWHP. But I'm not sure if its a solid roller set up or not. Its a bad *** car......

.

 

Not being a smart *** but if it were that easy everybody and there momma would be running around with 500 rwhp cam only

 

It's in the details, bet the trans is super efficient, light clutch, light driveshaft. Light everything. Mine made 427 rwhp with heavy 28 lbs flywheel, factory water pump, with a ported fast 78, factory trans with 28 inch slicks and 4.56 geared 9 inch. I know I could have gotten close to 450 rwhp with bigger intake and different wheels and clutch etc.

 

I like the dingle berrys in here trying to tell you what will work or not, you obviously know what you're doing lol. Heck id put it together juss to embarrass some forced induction cars that done even run that fast, dont get me wrong theres plenty of fast ones out there but I get tired of seeing 7-800 or so rwhp cars that run like crap. I say go for it you can do it.

 

Here you go:

https://www.youtube.com/watch?v=JPQj...tailpage#t=411

 

What cam are you running to hit 525whp on a 346? I have never heard of anything close to that.

 

It's a custom hydraulic cam that works well for my specific setup.

As I mentioned earlier, I believe that's the case for several reasons.

One being that people settle for off the shelf aftermarket parts and don't challenge themselves or their performance shops enough or simply don't want to spend the $ or time it takes. A lot is in the details which takes time, and that time cost exta $,especially if you are not doing the work yourself.
Others are satisfied with the average hp and that's enough for their needs.
And likely all of the most savvy racers don't even discuss their setups.

 

I'd like to think this as well. Somehow I have a hard time believing 525 on stock heads, cathedrals no less (not to mention plastic 90mm intake only and steep gears).

 

No one said it was easy.
All I can say to you and other doubters is that we are not new to pushing the envelope with our n/a setups. My tech even tore down my car at a track rental in 2009 to show the car was legit and GM high tech performance magazine showed up and did an article on it.
That's probably not hard to find.
And in case you didn't read the thread, my brief explanation in post #26, and #56 gives you my point of view.
And for those who like drag strip videos I've included that as well in post #54.
There's not much more I can say but that I stand by my original statement that 575whp is quite possible out of a H/C/I 346ci SBE ls engine as described in the 1st post.
And I have little doubt that I can achieve that with the addition of heads, intake, and some compression to my existing setup.

 

Cool. So where are the other cam only 346s pushing 525rwhp through those kinds of mods?

Or are you guys literally the ONLY ones to do so in 19 year the history of the LS1/LS6 engine?

 

Not sure, but in case you didn't read the thread, here's my take on it from earlier posts.

1) One being that people settle for off the shelf aftermarket parts and don't challenge themselves or their performance shops enough or simply don't want to spend the $ or time it takes. A lot is in the details which takes time, and that time cost exta $,especially if you are not doing the work yourself.

2) Others are satisfied with the average hp and that's enough for their needs.

3) And likely all of the most savvy successful racers don't even discuss their setups let alone post about them.

If it helps our cause (lol), we were one of the only street car setups to run nines with a 346 SBE almost 10 years ago. I drove to the track on a street night with a drag radial, ran some solid passes, and drove home. That setup was making well over 500whp as well with older technology and less knowledge on our part.

 

Sweet video, putting it on them other guys by a good margin. On the setup with the fast intake what kind of intake setup did you run? Did you use a velocity stack or what?