sschoeffler

iTrader: (24)

Stock L92s or Patriot stage 3
Patriots flow:
Intake: 322 @ 600 Lift
Exhaust 236 @ 600 lift

Patriots are LQ9 heads

Not sure of stock L92 flow numbers, but I have an opportunity to grab these patriots up for 900 shipped. So whats a better head choice for a stroked 6.0 to 408.
Plan on shooting NOS.

Do the L92s only allow me to use the L76 intake setup? Will I have to use a 90/90 setup because I wont be able to use the L76 intake?

Also Texas Speed has the ported LS3s brand new not assembled for $1124.99 that flow:
Intake : 349 @600 lift
Exhaust : 232 @ 600 lift

sschoeffler

iTrader: (24)

Come on guys, anyone?

Texas_WS6

iTrader: (9)

I personaly like the L92 head better. You will have to change the intake and fuel rail system to go to the L92 heads. If you do not want to spend the money of changing the intake set up then I would go with the Patriot head. The thing to keep in mind is the plastic intakes kill all of these heads. It does not matter who's plastic manifold it is, they are all a waist of money. None of them will flow the potential of the LS head after the heads have been ported. If you want to realy realize the potential of the LS heads you will have to convert the intake/ fuel rail system to either a single carb EFI manifold or a custom sheet metal manifold.

At least thats my 2 cents.

fknsmshn

iTrader: (1)

It sounds like the Patriots are the way to go for you. Those numbers are a lil better than the L92's if I remember correctly. Also, itd be cheaper since you wouldnt hafta change your manifold and fuel rails.

BlownVette 2001

iTrader: (2)

If you're going to run high RPM's the Patriots are the way to go. The L92's choke out around 6300.

Plus, why spend all kinds of extra money for parts you already have.

PONTIAC SLP

iTrader: (3)

are L92 heads chambers is 70cc?

BlownVette 2001

iTrader: (2)

That is correct.

sschoeffler

iTrader: (24)

Awesome guys, lets keep the poll going. Nice to see you guys think the L92s are really that good.

cowboysfan

Patriot heads here for the same reasons already stated....

boostnificent

iTrader: (7)

i was curious too. does anyone know?

Disturbed Bird

iTrader: (9)

l92's best flowing head unless you plan on paying $3,000+

the gm intake you have to buy is what kills these heads, good thing fast is coming out with there l92 intake mani vary soon 102mm TB opening off the mold.

im pretty sure i saw a flow sheet of a stock l92 head flow 350cfm

Texas_WS6

iTrader: (9)

They do not flow 350 stock. Mine out of the box with a valve dropped in it, no valve job or anything flowed 318cfm. With a three angle valve job and a quick mild pocket clean up they went 340 cfm. With a good head porter they might be able to go 375cfm, but the plastic gm style manifold killed the head. In order to reach the potential of the head you have to go to a very good custom manifold. You can compremise and go with either the GMPP or Edelbrock 4 barrel carb style manifold with fuel injector bosses drilled and a elbow on top that makes the turn and converts from 4 barrel to GM Throttle body. This is what I went with. You can see the picture of my engine under my name to the left. With this combo, no port work on the manifold, the three angle valve job with the mild pocket cleanup I am getting 327 cfm threw the manifold and elbow. That compared to only about 280 cfm threw the plastic gm manifolds. The factory manifolds kills these heads, but a good manifold will make them preforme very well.

Something to keep in mind, I know the patriots flow very good. There are alot of LS6, LS1, cathedral port heads that flow very well. They all have the same hinderance that the L92 heads have. The Plastic manifolds. Even the aluminum manifold that are cast like those factory manifold hurt the LS heads. When I say hurt, I am saying the heads have more flow then the manifolds can flow. I wish some one would come out with a manifold that could equal or even better, complement the heads flow. When we get a manifold that can do that, then the LS will truely come into its own.

Disturbed Bird

iTrader: (9)

ya what i saw was a SDPC cnc L92 heads flowed 350

1cdub

iTrader: (5)

at what lift and what bore size??? you guys are not taking into account alot of variables.

Texas_WS6

iTrader: (9)

Mine is 347 at .600" and pretty much flatlines from 0.600 to 0.700 Thats with the 4.030" bore. With the manifold and elbow I am using It cuts it down to 327 at 0.600" and the 4.030" bore. We are looking into building a manifold for the head next.

boostnificent

iTrader: (7)

does anyone know if TEA has a CNC program for L92's?

TVWilkes

I say go with PRC L92 heads.

boostnificent

iTrader: (7)

these are the #'s for TEA's stage 1 program.....

Flow Data
Flow Information
Intake /Exhaust
0.1- 67 /53
0.2 -150 /118
0.3 -226 /173
0.4 -287 /219
0.5 -332 /247
0.55- 347 /255
0.6 -353 /264
0.7- 368 /266

is it me or do the exhaust #'s seem a little low compared to other castings?

their web site says stage 2 #'s are on the way.

1meantransam

iTrader: (8)

i put the L92/LS3 heads on my 6.0 build. they flow 360 from texas speed. with my setup i made 430 horse... 6.0 iron, L92s, and an L76 intake manifold, small cam. with right manifold and cam i can make just under 500.. the L92s are the way to go. in terms of buying all kinds of extra stuff i'm not sure what anyones talking about there? all i needed were the new intake rockers and pedestools (spelling) for them and you can reuse your old exhaust rockers.. only cost me 1400 bucks.

Texas_WS6

iTrader: (9)

I think what every one is talking about buying extra is to go from LS1/2 cathedral heads to the L92 he would have to purchase an intake manifold, either the L76 with the fuel rails (or aftermarket fuel rails) or the Edelbroke or the GMPP Carb/EFI manifold, along with fuel rails and elbow. All of which he would not "have" to purchase if he went with the Patriot LQ9 heads. He could continue to run most of the intake system he already has.

I would think the Patriot head would end up being less expensive in the long run then the L92's. I personaly have the L92 and love them. Something else to consider that I do not think has been mentioned yet. Due to the intake valve being posistioned diferently on the L92 heads, flycutting the pistons will most likely be needed. So if you are planing to due a head swap, and were wanting to run the same shortblock, this most likely will be a problem.