NVR4GET

iTrader: (3)

You got the r6 I have no problem whooping them up.
Matt

LS1-450

iTrader: (33)

With all the back & forth in the responses here, I'd bet your head is spinning. IMHO, work the problem out w/ the guy you got the parts from.

-Head should be matched to cam regardless
-LS6 intake flows plenty just need to unrestrict the inlet by going to a larger TB, ported MAF, & a filter that is flow rated over 1000CFM. There are ported 78mm TB's that flow better than the BBS 80mm on e-bay for less than $200.00. You get another $60.00 off if you trade yours in. This could be an inexpensive way to increase the intake flow & increase engine VE.
-tune to 13:1 A/F ratio as has been mentioned.

So, you have your guy work w/ the cam manufacturer to better match the cam to the head, increase engine VE by modifying the the TB, MAF, & filter, re-tune & you're done. Other way is to spend the money to modify the head, etc., etc., etc..

Bigger injectors & high flow fuel pump would be a good idea.

Shawn MacAnanny

iTrader: (12)

Yeah the injectors i might purchase as well. Some 42.5lbers. The fuel pump i was going to upgrade when i did the nitrous setup. Fran says he is going to port the TB. Should i descreen the MAF? From what i hear only the 01 Z06s had screens in their MAFs.

You dont think the Vararam is a good filter? I have the 2nd gen one with the better filter supposedly. I like the idead of semi-ram air at top end.

LS1-450

iTrader: (33)

I don't know the spec's. for the Vararam filter. I was commenting about filters in general. Just check with them on the flow rate. In most cases, (not all cases) the manufaturer will design for 28 in. of water pressure drop across their unit whether it be a filter, MAF, intake tubing...etc.. The pressure drop that I have found to provide the best air flow into the intake is 10 in. of water or less. For this reason, I have suggested that your filter be sized for over 1,000 CFM (1,200 +) is even better. Keep in mind that the filter should be sized based on a normal intake vacuum condition, not only for the times you're @ speed forcing air through.

Can't comment on de-screening the MAF as I have heard pro's & con's, but, haven't experience with de-screening. Will say that often times a MAF can be the cause of restriction on high HP engines. Would do what can be done without consequence to increase flow through the MAF. Good-luck!

BlueSix

Race against an R6....realistically it will take a little over 500 rwhp to beat a very well ridden 600cc (the modern...2003 and new....ones). However, very few bikes are ridden to their fullest potential, even in a straight line. Take the race up to 150mph (not somehting i condone) and you should win.

back on topic.

You will see a noticeable increase in power from a 90/90 combo. The LS6 intake begins to choke flow in the higher RPM's, and with those heads and big cam you need all the flow you can get up there. I strongly believe that a 90/90 will get you a significant gain. Milling the heads for some added compression will also do wonders. Something else....take the car to the track and see how it runs. Just because it dyno's low doesn't mean it's a dog. I wouldn't mess with the MAF personally, i've personally seen a completely stock car run like complete **** from a descreened MAF. If you still can't find the power you are looking for with the above reccomendations i would look into having a custom cam ground. Good luck man.

roadrash9r

iTrader: (2)

Ok guys read my post. I said AFRs are better street heads. And there is no such thing as too much velocity. The goal is to achieve the highest velocity while still supplying the cylinder with as much air as it wants. The bigger is better is huge on this post. Look at the comparison. 205cc chambers 290cfm. this will be a better head for a 346 ON THE STREET. now your head SHOULD make more peak hp. "should". But the area under the curve, will suck compared to the afrs. This is fact. More velocity more response more torque = more hp under the curve. Horse power is Tq x rpm / 5252 = hp. Look at anybodys site. AFR 225s are not recomended on stock cubes. Too much port and not enough cylinder volume. added that you have 2.055 valves you could be shrouding it.

roadrash9r

iTrader: (2)

An ls6 intake is not the reason for the low numbers. I would say you have too much head for a 346, your headers are to big, (look in hot rod they lost power with 1 7/8th headers on stock cubes) and with low velocity due to stock cubes and big runners, your cam is hurting you. I agree with the exhaust duration hurting as well. I feel this is a miss matched combo. Others will prove me wrong. Im trying to help. I Am making 35+hp and 40+tq more than you with a small cam and as im hearing, CRAP AFR heads. (awesome heads) My cam is 224 224 112 567!!! 567!!! so its tiny, my headers are 1 3/4 my throttle body is stock my maf is stock, and Its an ls6 intake.

Shawn MacAnanny

iTrader: (12)

Well it may be. I'll put in a 408 eventually but i really think there are still other problems pertaining to the tune and such.

roadrash9r

iTrader: (2)

Im sure there are some tuning issues but if you do go 408 you definately have the supporting mods for it.

Shawn MacAnanny

iTrader: (12)

Well we're going to desensitize knock and lean it out the next time it's tuned. We didnt monitor knock and its only 30 degrees of timing advance from 6200-6800 rpm the rest is all at 28 degrees. We are also installing 42.5lb injectors, getting an alignment, porting the TB, and pumping the tires up to 30psi and we'll see where that puts us.

SideStep

If you are not getting any KR why are you desensitizing the knock sensors??? You mean you DID get knock, right???

Shawn MacAnanny

iTrader: (12)

We couldnt check with LS1edit so no one knows if we are or not.

ninobrn99

iTrader: (8)

i know someone that has a set of 42# green tops for sale..about 250 or so...he had to bump up to 60#

Frans96SS

iTrader: (15)

we already have some for the car but thanx for the offer

ninobrn99

iTrader: (8)

no prob.

roadrash9r

iTrader: (2)

Let us know what they find out!!!!! I am very intrested in seeing what was wrong... Good luck!

LostCauseZ06

iTrader: (4)

lol well add another "cool board member" to the list hehe im 19 years old and pay 100% of my 02 Z06, i ordered my 408 iron shortblock from HPE last tuesday! i highly recommend them to you, just pay the extra money and do it right, im looking for 520 RWHP NA, they put down 479 through an automatic the other day with their "super E" cam...

anyways, good luck man, i hope you get this figured out and get up and running with good numbers!!

Shawn MacAnanny

iTrader: (12)

Dude thats awesome. I need to get my 408 before i turn 19. I wanna be into the 9s before i turn 19. Lol. Still havent heard anything from Fran yet. I know he's trying to figure it all out right now. I should haev the car back by this weekend.

Spinmonster

I don't mean any disrespect sir but that cam has an intake closing point of 79 degrees unless you have some advance built into it. That is 7.4:1 dynamic compression. You need to boost a full point to get to 8.4 static for pump gas and I would go even higher. So you left at least 15rwhp from the compression alone on the table and far more torque.

I think you didn't boost the CR because that cam wouldn't fit and you didn't want to notch the pistons. As for getting 430 to the wheels with that cam on other cars, I could get 430 with that motor stock and a LG cam, headers, and UD everytime. For the record, I got 441 to the wheels with a 224/230 xer cam off the shelf from comp cams in essentially the same motor you put this monster in. My HP peaked around there too so you have something very wrong if your dyno sheet is showing a peak at 6400-6500 with that cam.

greekss

damn how do u guys afford Z06's with all those mods and still be under 20.....

I guess u guys arent in school ?