CBIII

iTrader: (6)

i know this has been discussed alot, but ive yet to really get any decent info on the subject..

somewhat daily driven street car.
408 with vengeance ported 92/95mm TB massively worked 5.3s and tiny tsp 231/237 cam.

Im heavily considering pulling the hci and selling it in favor of a good l92/custom cam setup, since i imagine id only be out a few hundred after all is said and done for better (?) parts. with that being said, would i want a l76 or a single plane? if single plane, carb-style TB or elbow and use my 95mm REVx TB? 100% street driven car too.

I know id make more power and most likely be alot happier with TFS heads, but right now its just not in the picture (since ill need a rear end soon)

silverbeast

iTrader: (16)

you do not want the single plane intake setup for a 100% street car. You will loose to much bottom end power. I would keep the fast setup and get a set of heads that will work with it and save yourself alot of money. If the TFS heads are out of your budget get yourself a good set of budget heads until you can upgrade. I have a set of Patriot stage 3 heads for sale that i made 540 rwhp with a fast setup for sale if you are interested. just shoot me a pm.

CBIII

iTrader: (6)

Ive GOT good heads, but i need better. i dont think ill be able to do waht i want with stock castings except l92s) and my entire basis for going l92/l76 or single plane is becasue i could sell my heads and intake and buy the l92/intake for almost the exact same price.

silverbeast

iTrader: (16)

what kind of power did your setup make?

CBIII

iTrader: (6)

426/427 untuned on a dynomite dyno...

silverbeast

iTrader: (16)

damn, that dosent sound right. thats very low. good luck with your project

CBIII

iTrader: (6)

thanks..

CBIII

iTrader: (6)

ater doing som math, I think my options are opened to TFS and potentiall ETP ls7 4" also

kmracer

iTrader: (1)

so has the car been tuned yet?

the torque seems to be in the right area.

Krazy98Z28

iTrader: (12)

I hope your not driving the car untuned.

If your a street car do not go with the carb style intakes.

I recommend the TFS heads but no matter what head you go with, it will be better than the heads you have now.

StreetStalkerZ

iTrader: (1)

Sometimes i wonder if people try different setups before they claim what is streetable and what is not

I drive my Z everyday to work,town and the store with Zero issues of my carb. intake. There are several of us that have them in my location with no problems of streetability.

If your wanting to stay with the 5.3 heads that is fine to do but understand that the smaller chambers leave alot to be disired on the table with power,you can make good power with them though. If you can spend the cash look into the TFS 235 cc heads they flow as good as most out there and you can get them in a timely manner.

Step the cam up more and either get the carb style intake setup with a elbow or a FAST 92/92. I personally think the FAST is a waste unless you port it.

My setup is a 370ci LQ9 that put down 447rwhp/402rwtq with only 200 miles on the engine at a local mustang dyno through a unlocked 4000 stall. That was with a stock size lid,stock MAF,stock TB and a LS6 intake. Your power should pick up with the cam swap and intake change alone.

Krazy98Z28

iTrader: (12)

My reasoning for saying its not meant for a street car, is if he went with a carb style then he would have too in most cases trim the cowl for a TB or Elbow, and then have issues getting a air filter for the 4 barrel TB. Not everyone wants to hack up a nice street car.

I have a carb intake on my car and I would drive it around town but I don't consider my car a street car.

StreetStalkerZ

iTrader: (1)

Yes a 4 barrel setup would require you to lose the entire or half of the cowl along with losing your windshield wiper blade and a hood like yours to cover it but he could run a elbow for hood clarance with hardly any triming of the cowl. The only thing with the lower profile elbows is that they can choke the air down before entering the manifold but if you have a hood you can get away with a higher profile elbow.

$850 for carb intake,elbow and fuel rails vs. $1200 for FAST intake then another several hundred to port it. If it were me i would shoot for a carb setup and take the extra $500 and get a hood lol but that is just me

Power wise IMO the carb intake will shine the most and with 6.0L engines we already have more torque than we can deal with on the street anyway.

CBIII

iTrader: (6)

the tune has been played with by a few locals who are decent at it, but i got frustrated and parked it. The flow numbers on the 5.3s are around 298@500 and 314@600, and have 70cc chambers i believe (been a long time since ive looked into them) I think im pretty much sold on TFS 235s/custom cam and ill just keep my vengeance 92 and be done. Ill be spending more money but i imagine ill be alot happier in the long run.

StreetStalkerZ

iTrader: (1)

Looking at your current heads,just getting more compression will make a big difference for you as you set. If you can get the TFS 235s and cut them to give you a 11:1 compression ratio you should pick up alot of power.

I have a friend that has a 408,TFS 235 heads,25x dur./.62x 112 comp. cam,ported edelbrock Victor jr intake with all the other bells and whistles to round off the combo. He put down 480rwhp with a AF ratio of 12.2 and 731rwhp/800 ftlbtq. on a 250 shot with a 11.1 AF ratio. He has alot left on the table with leaning it out but they ran out of time on the dyno. With a better elbow,leaning the motor out some this motor will put down well into the 500rwhp range NA and close to 800rwhp on the nitrous (bottle pressure was at 900 on the 731/800 pull. This is in a 05 silverado truck lol. Look up his dyno run that is posted in the dyno section under bpowell688 "Dyno pulls from last night"

CBIII

iTrader: (6)

SCR is ~11.7:1.-1.8c pistons and GM 6.0 gasket.
Ill retain my vengeance 92/revX 95 instead of a single plane.