Thanks guys for all the replies,

I've got an engine builder here who has been around forever doing racing applications. So, I will get that accomplished through them.

The reason why I ask about the #7 problem is becase I want to get it fixed right. How certain are you guys on the intake. That's what I was leaning towards to begin with, but how can I seriously correct it?

I will try to get the injectors tested, but something tells me that is not it. Not everyone is going to have the same injector go bad without a good reason.

Hey Bill, can you post a link to that corvette thread?

 

Great thread!
So do the after market engine/head combinations have the same issues or are they just stout enough to be able to handle the extra abuse that #7 may encounter either from bad coolant flow or running lean?

I had experienced a stumbling/rough idle and also a 3-4psi loss of vacuum around the same time the engine started pushing oil out any place that was a weak link, could this be a sign for others to watch our for?
For the record I still have a Nelson tune that runs pretty fat, I don't think I went lean but will be checking #7 this weekend, finally got the leak down tester from my neighbor.

To all those who have had this failure, I feel your pain.

 

Ya it sucks goat ***** for quarters. I can't wait to pay for this one. Like I said in my last thread, these kits need to come with warning labels. And someone needs to start PA, Poweraholics Anonymous.

 

im a victim too. im going with everythign ive found to hopefully help, includin ga forged motor. npg+ coolant, vic jr intake with elbow, flowmatched injectors, 160 t stat, hopefully no failures im not going nutty with it just 15 psi plus 100-150 shot of go go juice.

 

not jack the thread but....

question still remains...
why do radix engines not do this
i had a nelson tune, not stock radix tune which may be safer,
ran hard at 9 psi, no issues, well tranny, not related to this thread

if it's the tune, then nelson has got it right

 

because magnacharger spent some time and money on R&D and saw the problem and fixed it when designing their lower intake manifold

 

i agree, it's intake, not tuning or block coolant flow

see above post by me

w2w did their homework too and came to a different verdict.

it seems the same issues apply to late model vettes with FI so a firm theory
would be cool.

I ask because I have a new 6.0 and would like to try a rotrex but don't want the #5-7 deal

 

Your injectors are probably OK... but it never hurts to check them out. I am not saying the injectors are the culprit so much as I am suggesting its a possiblity.
I am not "sold" on the truck intake manifold being the problem... as LS1/LS6 guys with a completely different intake manifold whether stock or with forced induction are also losing #7... to the point to where it also kinda sticks out enough to be a topic of conversation. It could also be that the older LS1 intake and the newer style LS1/LS6 intake somehow share the same flow descrepancies regarding #7 as the truck intake does... assuming this is indeed the problem... but I would like to see some data on that.
How can you correct it? A good tune for starters... I have not heard of #7 failures with competant tuners... I have heard of failures with tuners still on the learning curve... so to speak. Pick a known tuner with an excellant reputation and I believe you can put your worries behind you... without the need of changing the intake manifold... just my opinion.

Here's the link to the thread I started over on the Corvette Forum...

http://forums.corvetteforum.com/show...post1560156092

Bill

 

GM got it right.The motors aren't made for boost.Pretty simple to understand There is also a bunch of tuners out there that have no clue either.Can't remember the last time we lost a piston and running 12-14lbs of boost on a stock motor is pretty normal here

 

So you are saying that a stock motor can take 12-14 pounds of boost on a day to day basis and live? You might want to send me some of that pixie dust or holy water you are spraying on these stock motors........there are ALOT of people that would beg to differ with you on that....and most of them are GM engineers. There is no way that the stock pistons will take the cyl pressures that are delivered at 12-14 psi with a reasonable amount of timing on pump gas....and live for any decent amount of time.