HAte

collectively ive done about 3 hours of reading and searchin around for someone who has done a build close to what i want to do and cant find much.

last week i almost bought an ls6 shortblock to build but then i started kickin around the idea of a lq9..... then i started searchin and cant really find anything to impressive yet

my goal is to make atleast 500rwhp. id be happy at 500 but theres nothing wrong with a little more

but cant decide between a ls6 or lq9 only from what ive seen so far,

id figure a lq9 with a big ol' cam either shelf cam or spec'd out from pat g or so, along with a ported FAST intake AFR 215 or 230 heads with a small combustion champers pulleys throttle body to match the FAST long tubed and full exhuast....of course ARP all around and big injectors maybe some different pistons



are you just not going to see 500rwhp with that or not? all i can find is people using stock heads and such

would a lq9 have to be stroked or bored or both to see these numbers?

or is it gonna be the same as doing all the same mods to an ls6 with give or take 20-30 hp ?

bww3588

iTrader: (49)

Instead of dropping the money on afr heads, put an ls3 top end on it. I have a 370 with an ls3 top end, (stock heads and intake) and I'm shooting for 500.

People are making 500 at the wheels doing ls3 top end swaps on ls2's with a good cam. No reason it can't be done with a higher compression iron block.

93Z2871805

iTrader: (5)

I'm doing the same thing except on a stock LQ9 bottom end (rebuilt with clevite bearings, total seal rings, arp bolts). I'd like to see mid-high 10s N/A (around 460-470 to the wheels).

Do you have any links to some of these? I'd like to see their setup compared to what I'm doing.

bww3588

iTrader: (49)

I'll dig one up when I get home. There is a thread in the gen 4 internal engine section of a vette with an ls3 top end putting 500 ish to the wheels.

93Z2871805

iTrader: (5)

I'm running (in work) a 96mm TB, 1 7/8 Hooker LTs, EPS cam, 4k stall (TH400), M9 (3.89s, may go steeper but I have plans to hit it with a 100 shot), target weight is 3300-3400 with me in it and the 10pt moly cage. I'm not too concerned with a dyno #, I just want to see 10s off the bottle. However, if my setup is along the lines (at least close) with a 500 rwhp car, it should have 10s in it with the suspension dialed in. Sorry if I hijacked your thread at all OP.

HAte

nahh didnt hijack it..............terrorist...... jk haha

i just want some info from someone see some builds..some numbers.. somethin

i looked around youtube, guy had a pretty stout lq9 on a dyno...and he only made like 435 to the wheels... i have to hit at very least 500 to wheels.

"bww388" what sort of info do you have about ls3 top end? benifits over after marketed top end?

any one else feel free to put in info

btw i have an m6 and will be running 411's through a 9inch eventually

bww3588

iTrader: (49)

300 + cfm on the intake side bone stock...I picked up my brand new ls3 heads for 700 bucks. These heads will flow more than enough for a 6.0 right out of the box. Combine them with a custom cam, up the compression a little and put a fast intake on it, and I don't see why you wouldn't hit 500. Only problem is your either going to have to fly cut the pistons or change to a forged piston with valve reliefs. The huge intake valve does not leave a lot of room for a larger cam, although, the ls3 heads flow so good, a huge cam is not necessary. Which means less aggressive lobes and longer valve spring life, and better driveability.

bww3588

iTrader: (49)

I too have an m6 with a 9 inch and 4.11's.

I'm going with a 90 mm tb on a stock ls3 intake with an ls7 maf and a 98 mm lid. 1 3/4 to 1 7/8 headers back to dumped duals.

HAte

hmm i hear ya, ill have to do some reading on the ls3 heads for flow #'s.

the engine will be ripped down anyways im fine with fly cutting the pistons, no big thang there. whats the numbers on your ls3 heads for reference (i.e. ls1 "243" heads) ?

bww3588

iTrader: (49)

https://ls1tech.com/forums/generation-iv-internal-engine/1502829-my-ls3-h-c-combo-added-twin-turbo-my-ls2-c6-z51-vette-build-list.html

bww3588

iTrader: (49)

0821 is the ls3 heads with light valves, 0823 is the l76/l92 heads. Same head design with heavier valves. They can be had a little cheaper usually.

bww3588

iTrader: (49)

Just keep in mind cam selection changes totally with the rectangle port heads. Your going to need 8 to 12 degrees split between the exhaust and intake duration because of how much more the intake side flows compared to the exhaust.

93Z2871805

iTrader: (5)

Lol.


The cam I'm running is just a little more aggressive than the one that guy with the C6 is running (.600in lift and right at .100 PTVC). Also, I'm running an SD tune (gotta keep the 93 thing going lol), and a K&N 98-02 FIPK with my Ultra Z hood. Honestly, at this point, I can't justify throwing the $1k weight reduction mod to my bank account for a FAST intake setup (I'm going to continue to look elsewhere for power until I "NEED" it).

Agreed, mine is a 12* split

93Z2871805

iTrader: (5)

My GMPP catalog says:

intake:

.200 151
.300 208
.400 256
.500 294
.600 316

exhaust:

.200 111
.300 152
.400 174
.500 183
.600 189

Data based on a 4 in bore

HAte

edited: for stupid thought at first,, i see fast makes an intake for the l92 head

the other corvette build thread i see he never got it dynoed yet.

bww3588

iTrader: (49)

I must have mixed threads up. I appolagize.

From the flow numbers posted, it looks like if the exhaust port was worked over quite a bit, and the intake just de flashed, you could probably run a traditional split cam and make killer power.

93Z2871805

iTrader: (5)

Even on a stock un-touched head it would make sense for more duration on the exhaust side to crutch the lower flow numbers in comparison to the intake.

bww3588

iTrader: (49)

By traditional I ment closer split as opposed to 12 degrees. Unless your exhaust flows better than your intake, there is no reason for a reverse split cam.

93Z2871805

iTrader: (5)

Oh got ya, I read that backwards, lol. I was agreeing with you on more exhaust duration, I'm running 12* more on the exhaust side.

bww3588

iTrader: (49)

I was getting at if you open the exhaust up, you could add more duration to the exhaust lobe, thus decreasing the total split.