brock1949

iTrader: (1)

Ok so here’s the deal, I’m building a 30k miles LQ9 for my dads classic truck. The focus here is reliability then performance. Quick background truck is going to weigh 3000-3300lbs area done, 4l80E trans with probably a small stall, built 8.5 rear with somewhere between 3.55-4.10 gears but its most likely going to be on 18’s or 20’s that might have a little weight to them. He’s hoping for a 100k mile kinda motor that can handle running 18 hours strait if he wanted to take it on a long road trip. That being said the power goals are going to be 450-500 Crank HP. Again the focus isn’t all power.. what we get is what we get but we want to make a good attempt at hitting 500hp crank on a very drivable conservative motor (I know the 4l80E is going to eat the RWHP etc but we’ll live)

We’ve decided to run the L92 heads on this motor which we figured will put us in the 10.5:1 CR area if I can properly use a slide scale which is what we were hoping for. We want to keep the lift below .550 and I’m probably not going to turn it past 6400-6500 rpm seeing how were probably going to run the L76 intake and I doubt it does much past 6100-6200 even on a 6.0. As of right now we are looking at the comp cams XR277HR 54-418-11 and possibly just advancing it a couple degrees when installing it to bring the RPM range down a little (checking clearance etc). That cam is .534in /.537 ex 224/228 intake center 110. The builder I’m using says he’d like to go with comp beehives for the springs saying he’s had great luck with street motors on them, I do run them in my turbo truck and have good luck so far..

Now for upgrades/maint to the motor, I’m planning on new water pump, new injectors (needs bigger anyways), Head gasket..(pointers??) new GM or ARP head bolts, swapping out plastic lift trays, swapping in ARP rod bolts, putting a better oil pump on.. builder is researching this but I need some advice here.

I’m just looking for some input on some of the variables, valve springs, cam, stall speed, gears.. any suggestions.. pointers. Were not new to engines by any means but I am somewhat new to Lsx’s and want to make sure I’m on the right track.

And yes i've spent weeks and weeks searching this forum and many others to come up with the variables i've selected to this point.

Thanks!

brock1949

iTrader: (1)

Figured i left a large part of that out unless from the injectors you guys picked up on it.. Truck will be fuel injected. Speartech is going to be building the harness and most likley we will be running drive by wire configuration. Truck will be dyno tuned.. by someone, That parts still up in the air my Dyno guy quit tunning so if someone know a dyno tunner I have this truck and another S10 build with a turbo LQ4 setup thats going to need factory ls ecm tunning. I'm in canton/akron ohio.

Thanks again

brock1949

iTrader: (1)

no one has anything?

I've been searching this forum for years and a member for over a year, bought and sold off here and my first actual post gets no repsonse lol.

the_merv

iTrader: (88)

Everyone is going to have a different opinion..

I built a 402 LQ4/L92, here is a list of what I did..

GM LQ4 IRONBLOCK
EAGLE FORGED 4340 4.000" CRANK
EAGLE FORGED 4340 6.125" H-BEAM RODS
MAHLE FORGED ALUMINUM 4.000" -12cc DISHED PISTONS
COMP CAMS CUSTOM GRIND: 243/247, .621(XFI)/.612(X-ER), 114+3 LSA
GMPP L92 HEADS MILLED TO 65cc CHAMBERS, 10.8:1 COMPRESSION
GMPP L76 INTAKE MANIFOLD
MELLING HIGH-VOLUME OIL PUMP
CLEVITE 77 P-SERIES BEARINGS
LS7 HIGH RPM LIFTERS
MOLY PISTON RINGS
PRC .660 LIFT VALVE SPRINGS
TITANIUM RETAINERS, CHROMEOLY LOCKS
TSP 7.400" HARDENED PUSHRODS
FELPRO 1041 HEAD GASKETS
LS2 TIMING SET
LS2 FUEL RAILS, 34lb/hr INJECTORS
HOLLEY 90mm THROTTLE BODY

hookemdevils22

iTrader: (12)

Merv, where'd you end up numbers-wise with that combo? It sounds a little meaner than what brock is looking to do. And how are you getting away with 34# injectors???

I'm actually building an LQ4/L92 setup with a 4L80e (might sell it and go T56 though) for my '71 Nova. One thing I do know is that L92s like more split because of the large intake/exhaust valve size and flow ratio. But CarCraft, GM High-Tech Perf, and others have made 550 hp easily with a stock bottom-end LQ4 with as-cast L92s, so it shouldn't be too difficult. Keep us posted on what you end up with.

the_merv

iTrader: (88)

I haven't Dyno'd it yet, but with my Tuner, we logged it at 88% Duty Cycle at WOT..and it was puffing black smoke at WOT..so it seemed rich.

brock1949

iTrader: (1)

That isn't more agressive then what i'd be looking for but like i said trying to keep it somewhat tame for my dad, and 500hp in a truck thats weighs in at 2600lbs right now (stock) is going to be a riot. I'm going to try to keep everyone posted the hope is its running this spring sitting on its new suspension but probably will come apart again for paint ect in the summer/fall. I realize this is a popular question Lq9/L92/l76 setup so we'll see what happens with mine.

So far the only thing i know is Lq9 bottom, L92 heads.. probably L76 intake, and a cam around 224 with less that .550 lift.

Engine builder is extreemly good.. had my dad come with me one day and he said the magic 100,000 mile motor to my engine builder who responds with thats fine that means nothing over .550 lift, over 10.8-11:1 build it to make the power below 6500 rpm and swap out rod bolts for ARP, Oil pump, timing set and it should be ready to rock. He swears up and down he'll get 500 crank hp with the 418 cam.. 224 .537 lift.. 110 center says he's advancing it a couple degrees to bring the rpms range down. He tells me with that combo i should run a 2500 stall and like a 3.73-4.10 gear.

anyone know any really good tunners in ohio Pa indiana.. mi area?

brock1949

iTrader: (1)

ok i think i just solved it..

livernois has a awesome cam.. i think. IF no one says anything i'm going for it.

230/240 .590/.600 114LSA with the livernois springs and retainers JP double roller chain and a new factory oil pump. i'm probably going to couple this with a precision stall roughly 2200-2500 (going to call them for a rec.) Now what gears?

Tells me this setup will easily put 450rwhp down through that 4l80E on a safe tune.

last question IS .590 .600 TO MUCH LIFT for a street motor. will it make it 100k miles on a brand new set of L92's? My engine build swears up and down past .550 lift I will be back in a couple years with a smoking engine from valve guides shot.

brock1949

iTrader: (1)

Ok its done.. ordered over lunch break

From my machine shop
L92 heads bare casting (will get some slight bowl/port work by hand as needed
Ferrea or REV valves solid stem (not sure which he ordered..)
New oil pump
ARP rod bolts

From Livernois
Stage 2 cam, 230/240 .590/.600 114 LSA
Livernois springs & Ti locks and ret. (same manufacture as patroit only claimed to be 1 model higher)
JP double roller timing set

AND the kicker they said they will tune the truck 650.. but at least they are well known.
Claims this setup through a 4l80E should easily put down 450RWHP and has gone well over 500RWHP in other setups.. So high expectations.

I need a L76 intake with Throttle body.. new or used let me know what everyone has.

Also Livernois claims i can get that power running 34lb injectors what do you think and what does those L76 intakes have from the factory

hookemdevils22

iTrader: (12)

i don't think .590/.600 is enough lift. but some guys on here claim to have 450 rwhp and run mid-11s in 4k# goats with a similar setup. so i think you've got a solid setup.

brock1949

iTrader: (1)

Updates ...

Ordered
Precision 9.5" 2800 stall
HD2 kit for 4l80E
Should all goto trans shop next week for shift kit and stall fitting, 4l80E is stock 900 miles on it

8.5" 30 spline 10 bolt should be here tomorrow or monday. Factory disc setup etc off 2wd 5spd blazer 54" width, stock width on the 55 chevy is 58 so it will give me a little room for a deeper dish wheel and wide tire.

Planning on ordering Detroit Truetrack posi.. or zexel torsel anyone running either?

Now what freaking gears to run? going to run 18's or 20's on it and the overall tires size will stay resonable.

hookemdevils22

iTrader: (12)

80e's have a sluggish 1st gear.

59rat

iTrader: (5)

This is just for reference. My 3400lbs with 28.8 tall tire & 370 gears wouldn't get out of it's own way on the bottom end. Had to re stall the converter and a set of 410s. It woke the car up. I'm only 410 rwhp. Rod

brock1949

iTrader: (1)

i'm guessing we'll be closer to a 26 inch height running 18's or even 20's with a 245-255 35 series.

I'm leaning towards 4.10's but i don't want to go to crazy because i know my truck with a 31-32 inch tire (full size silverado) and a 4l80E turns 2800 rpms roughly going down the highway at 75, thats with 3.73 gears.

I love the 4l80e's gear layout and i actally really like the long first gear for the turbo stuff on NA its not as awesome but the close ratio makes up for it. However the .70 overdrive isn't something to write home about.

So you guys think on 3000-3200lb truck, 4.10's? even with a shorter roughly 26" tire?

8ByGoat

iTrader: (2)

Claim? Funny.

For your viewing pleasure.

68 RS Convertible

iTrader: (1)

Are you going to do c clip elimiator to your 10 bolt? On more than one 10 bolt I have broken the large pin that keeps those in there, and that was with a Gen I 350. Then I went to a 9 inch. If your gonna be putting 450+ hp through a 10 bolt I would consider the c clip eliminator. Just my two cents in case you hadn't considered it already. Sounds like a great build, good luck.

brock1949

iTrader: (1)

Thanks guys, i'm putting allot of time into this thing hoping for good results. I'll post some pictures of the truck (stock) when i get a minute.

8bygoat - That thing runs awesome, what kinda cam specs are you running if you don't mind me asking. What gears?

As far as my 10bolt I'm doing something like a detroit truetrack or eaton HD posi gears bearings having them check it to make sure its true after welding all the 4 link stuff one and hoping for the best on the C clips. The only thing with those i don't worry about it as much because at least its disc brakes will try to hold the axles in and it won't be quite as crazy. Only reason i don't want to do the C clip eliminator is i've never seen one that doesn't leak at some point, that and i've had good luck so far with 8.5's only failure i've had was one in my suburban at 110k the G80 exploded taking out the entire thing after it ran a couple peice of metal through the gears. I'm still running G80 8.5 in my S10 listed below, i just spin them slow to lock it then goto town.

brock1949

iTrader: (1)

So what are my options for these l92 heads, L76, sheet metal$$, wait for fast$$..

I've been shopping the L76 intake and keep coming up with a car version and truck version. Livernois says get a new vette one but i don't know for sure whats interchangable.. I still have truck acc. on it and would like the bigger style truck intakes with more torque.

8ByGoat

iTrader: (2)

Thanks I appreciate it.

Cam specs?? Totally wrong if you listen to all the experts LOL.
232/236 600/600 113lsa

Gears-stock IRS GTO rear end.