lsX power ?'s

[Suicidal Racing]

how much hp u think u could get out of a lsx engine using ported l92 heads say 8.5-1 comp,solid roller cam,carb style intake with a wilson elbow and big ass throttle body and a pt-98/88?

what would be the best block..i know the lq4 blocks can take some power..could i use that if i went with billet caps?

who makes the best crank also..i would probley go for like a 408cube engine.

[Louie L]

I dont know if this helps. My buddy built a stock cranked LS1 and put it in his Buick GN. At just over 3450 lbs, The car has gone 128MPH in the 1/4 with only 4 PSI out of a PT106! The motor had Mahle pistons, a 550+lift cam eagle rods and ported stock LS1 heads. Im sure at theres a boat load left in it.

[Robert1320]

Is it an LSX 6 bolt block or an iron LS-xsomething 4 bolt block.
the 4 bolts can make over a 1000 but keepiing the heads on
is sometimes an issue.

[Suicidal Racing]

it dont have nothing for it now and wont buy stuff for a bit..i just think it is a diff combo and would be bad ass..i know them heads are sick with port work..

pretty much i was just wondering what type of power could be had out a beast like that u know

[315plus]

My brother is running l92 heads on a naturally aspirated aluminum ls2 motor, and the heads are untouched with stock valves, and some bowl work.. Heads flow in the 340-350 range @ 700, and this in a 3300# car went in the 10's.. Those heads are sweet, don't need much port work, but if you are going forced induction, the exhaust will need a good port job

[tuff]

If you want to bulid serious power i would not use any stock block now that all the aftermarket stuff is avaible.I've pushed my nitrous motor to the point to were i can't keep the heads down no matter what trick head stud or gasket i use.I'm thinking of going little cheif now.

[Suicidal Racing]

can the l92's be ran on the lq4 block..this wouldn;t be an all out racing combo just something to toy with..probley toss in a 69 rambler and make a sleeper out of it.

[Collinsautomotive]

l92 heads will run on any of the 4.00 inch bore motors. the Lq4 is one of them. The debate over power holding on the lsanything motors has raged for a while. If you are looking for something under 800hp flywheel a stock lq4 block will get it done.I would however look at the newer Gen Iv 6.0 truck block. Much Much beefier thicker cylinder walls,thicker mains thicker deck its about 6-8 lbs heavier then the lq4 in all the right spots. I just got one of these block recently its even got oil sprayers for the bottoms of the pistons. Nice peice.

I geuss if it were a bit clearer as to exactly what you are attempting to build it would easier to offer any sort of reasonable advice.


can the l92's be ran on the lq4 block..this wouldn;t be an all out racing combo just something to toy with..probley toss in a 69 rambler and make a sleeper out of it.

[315plus]

I would however look at the newer Gen Iv 6.0 truck block. Much Much beefier thicker cylinder walls,thicker mains thicker deck its about 6-8 lbs heavier then the lq4 in all the right spots. I just got one of these block recently its even got oil sprayers for the bottoms of the pistons. Nice peice.

X2..This is the block I run

[Suicidal Racing]

Im going lq4 short block with l98 heads nice cam,carb and plate system..should be around 800hp on juice..going in a coupe with a th-350 and 4500 stall with 3.89 gears

[Collinsautomotive]

Ive got some experience camming those heads and that displacement. Tell me where you want the power band and I can offer some help.


Im going lq4 short block with l98 heads nice cam,carb and plate system..should be around 800hp on juice..going in a coupe with a th-350 and 4500 stall with 3.89 gears

[Suicidal Racing]

right now the cam i came up with makes good power from 3000-7500 and peaks at 7000 and looks like it will drop of a couple hp at 7500..i'm going to shift her around 7200.

i'm only using a desk top dyno 2000 to get a idea of what she will make.i'm going with a th-400 trans also.

i'm guting the coupe right now..

heres some pics of it.i'm keeping the hugger orange but painting over the stang.

http://i75.photobucket.com/albums/i299/7272000/PDR_0033.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0032.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0031.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0030.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0029.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0028.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0027.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0026.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0025.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0024.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0023.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0022.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0021.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0020.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0019.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0018.jpg
http://i75.photobucket.com/albums/i299/7272000/PDR_0017.jpg

[phil h]

l92 heads will run on any of the 4.00 inch bore motors. the Lq4 is one of them. The debate over power holding on the lsanything motors has raged for a while. If you are looking for something under 800hp flywheel a stock lq4 block will get it done.I would however look at the newer Gen Iv 6.0 truck block. Much Much beefier thicker cylinder walls,thicker mains thicker deck its about 6-8 lbs heavier then the lq4 in all the right spots. I just got one of these block recently its even got oil sprayers for the bottoms of the pistons. Nice peice.

I geuss if it were a bit clearer as to exactly what you are attempting to build it would easier to offer any sort of reasonable advice.


Do you have any idea on what max bore would be on one of these (Gen4) blocks? I just bought one myself and its going to be fed by a 101mm turbo.. Sounds like it will take some power.

[Collinsautomotive]

Depends on the power level. If you are planning on making over 800hp i would say stay as close to 4.0 as possiable. the Gen IV's I have had sonic checked have very minimal core shift but are still somewhat thin on the thrust side. The older lq4 block had problems with the cylinders walls bowing at around 1000hp and over. Given that the newer gen iv block is not that much thicker i would have to belive that to some extent that it will not take that much more power to start distroting the cylinder walls. Ultimately i would also recomend staying close to a 4.0 bore due to the fact that 2 problems arise at large bores. the first is gasket push into adjacent cylinders the second is head sealing. both of those can help to be controlled by using a smaller 4.0 bore.Remeber we are still dealing with an engine with 4.40 bore centers. Build and treat head gasket sealing issues like stock block mopars and small block fords.

contact SMC up in pontiac,auburn hills. He has some semi finished gen iv blocks that are rough bored at 3.955. perfect for a build up like yours.

Sean



Do you have any idea on what max bore would be on one of these (Gen4) blocks? I just bought one myself and its going to be fed by a 101mm turbo.. Sounds like it will take some power.

[Collinsautomotive]

Be wary of the desktop dyno simulations. if your are planning on running a single plane. the predictions that program makes about these partiuclar heads can be a bit misleading.

Are you planning on running a hydrualic roller or a solid ? there are some new parts out that may make one or the other easier.


[QUOTE=Suicidal Racing;461583]right now the cam i came up with makes good power from 3000-7500 and peaks at 7000 and looks like it will drop of a couple hp at 7500..i'm going to shift her around 7200.

i'm only using a desk top dyno 2000 to get a idea of what she will make.i'm going with a th-400 trans also.

i'm guting the coupe right now..

heres some pics of it.i'm keeping the hugger orange but painting over the stang.

[/qoute]

[phil h]

[
contact SMC up in pontiac,auburn hills. He has some semi finished gen iv blocks that are rough bored at 3.955. perfect for a build up like yours.

Sean[/quote]

I bought my block from SMC...I havent measured the bore yet though..Sounds as if i should stay at 4.00 to be safe...Not like 8ci is gonna make a difference anyway! I have boost to make up the difference!! Thanks for your help.

[Collinsautomotive]

if its a rough bored block it will be in the 3.95x range. rough bored will look like a lathe cut it inside out.



I bought my block from SMC...I havent measured the bore yet though..Sounds as if i should stay at 4.00 to be safe...Not like 8ci is gonna make a difference anyway! I have boost to make up the difference!! Thanks for your help.

[Suicidal Racing]

[quote=Collinsautomotive;462557]Be wary of the desktop dyno simulations. if your are planning on running a single plane. the predictions that program makes about these partiuclar heads can be a bit misleading.

Are you planning on running a hydrualic roller or a solid ? there are some new parts out that may make one or the other easier.

oh i know the dd2000 aint right nore accutrate..i do know people who have been with in 10hp and tq across the board when dynoign engines

plus it cant take in to fact the porting of intake.vacumm pump and other shit

i'm going with a hyd cam..of they had after market rockers for the L92s i would go solid then probley.

[Collinsautomotive]

mixed bag on desktop dyno. The problem is prodominately that you are sticking a large valve on a small displacement. the problem will be with overlap sensistivity. its a complex problem and a lot of people have fialed at camshaft selection on this engine.




oh i know the dd2000 aint right nore accutrate..i do know people who have been with in 10hp and tq across the board when dynoing engines

plus it cant take in to fact the porting of intake.vacumm pump and other shit

i'm going with a hyd cam..of they had after market rockers for the L92s i would go solid then probley.

[eb02z06]

I'm thinking about a LS2/402 combo for next season topped off with a set of L92's-but everything i've seen so far show it dies by 6200 rpm using the L76 manifold-even with a blower-any truth to this?

[Collinsautomotive]

I used to see the same behavoir with the ls6 intakes as well. You can make the camshaft move the power band if you know how.

Sean


I'm thinking about a LS2/402 combo for next season topped off with a set of L92's-but everything i've seen so far show it dies by 6200 rpm using the L76 manifold-even with a blower-any truth to this?

[fash00]

Wouldnt use the l92 heads with boost unless you enjoy changing head gaskets.Need something with a thicker deck height such as afrs or ets.Dart is also a good choice but out of all the aftermarket heads they have the thinnest deck. I would look into at least o ringing the head and depending upon power levels you will still push water but its not that a big a deal you can work around it

[eb02z06]

I used to see the same behavoir with the ls6 intakes as well. You can make the camshaft move the power band if you know how.

Sean


Everything I've seen so far no matter what the cam size shows they still fall flat at 6200? Maybe it's different with a carb intake? I've never had a problem going up to 7000 with the LS6 but this was only on a 347-I'll know soon how it acts on the 402.

[eb02z06]

Wouldnt use the l92 heads with boost unless you enjoy changing head gaskets.Need something with a thicker deck height such as afrs or ets.Dart is also a good choice but out of all the aftermarket heads they have the thinnest deck. I would look into at least o ringing the head and depending upon power levels you will still push water but its not that a big a deal you can work around it


I don't beleive that statement-I think you only push water if the car is detonating some.

[Collinsautomotive]

Actually I know of only 2 combos that will make power to 7000rpm with an ls6 intake and I have tested most of the popular stuff out there including its derivatives. There are some tricks to be applied but the direction you go in to achive the results is different to say the least. I will be working on something like this over the winter. I will post up when i get some info going. To date however I have a l92/l76 408 turning 6400 making power so something is amiss for sure in the general sceme of cam selection for the plaatic ls6/l76 intake manifolds.


Everything I've seen so far no matter what the cam size shows they still fall flat at 6200? Maybe it's different with a carb intake? I've never had a problem going up to 7000 with the LS6 but this was only on a 347-I'll know soon how it acts on the 402.

[eb02z06]

Actually I know of only 2 combos that will make power to 7000rpm with an ls6 intake and I have tested most of the popular stuff out there including its derivatives. There are some tricks to be applied but the direction you go in to achive the results is different to say the least. I will be working on something like this over the winter. I will post up when i get some info going. To date however I have a l92/l76 408 turning 6400 making power so something is amiss for sure in the general sceme of cam selection for the plaatic ls6/l76 intake manifolds.


Keep me posted-i'm very interested-those L92 heads are a killer deal for the money.

[Suicidal Racing]

i think f.a.s.t is working on a intake for the l92s if i remember right.

[qwiknotch]

The LS2/402, Dart 225, engine I am using has a Victor Jr and a carb.
We are going to switch it over to a solid roller and a Super Victor.

It made 798hp at 6700 with the hydraulic roller, regular Victor Jr manifold and a 150 shot
4inch stroke, 4 inch bore, 6.125 rod. unported heads and intake.
Hoping to pick up 100hp with the Super Victor and Solid Roller, and a clean-up job on the heads. If it picks up close to that, then I will hit it with a 250shot and go for it. I would really like to see 1000hp at the flywheel or at least 975.

Once I pick up my LSX block, I will transfer all the internals and then really lean on it with the nitrous... I think this engine will hit the 1100hp mark on a plate unit with a good block.

I also think with the solid roller and super victor, it will make power to 7400... I won't spin it higher than that, not worth beating it up, unless it keeps making power :)

[Suicidal Racing]

me and u will have close to the same setup man..i cant wait to see you run..the record for a n2o lsx is 8.27

[rambler68]

WHATS A GOOD SET OF HEADS TO USE ON THE LSX,. LOOKING TO MAKE BIG POWER WITH LIKE 427 CI. THANKS

[315plus]

WHATS A GOOD SET OF HEADS TO USE ON THE LSX,. LOOKING TO MAKE BIG POWER WITH LIKE 427 CI. THANKS

Et canted valve, or c5-r are basically your only options as far as heads go.. ls7 your limited with valve springs, not enough room, and not enough bulk in thr head

[qwiknotch]

Rambler, CNC AFR 225's are really good.

Suicidal, my car won't cert past 8.50, so that's the fastest I will be able to go until I get the car updated. I don't expect to go any faster than 9.20's for the first season, because I have to weigh 3200lbs.

But, you never know, it may go faster, 800hp is no slouch. I could always keep the car at 2800lbs and let her fly :)

[Suicidal Racing]

yeah..mine is looking to be around 2600#s when done or lower if i get lexan and fiber glass parts.

i'm only doing a 10 point seeing i will be running the 1/8th mile more then anything..i may take it to the 1/4 and make 1 pass or 2 and get kicked out to see what i can do.

i'll be on motor at first till i get tuned and get it running the best times i can then i will be spray it starting with 150-300.

hey if u dont mind will u pm me your cam specs? i got one i came up with that looks good on paper but i would like to get a idea of what most are running..mines a 250s/260s with a 114 lobe and .645 lift

[qwiknotch]

I find out what it is in it. Not sure right now. It is an off the shelf Comp Cams, I think it is the Comp 286HR... Once I switch over to the solid roller, it will be probably really similar to what you have...

258-264@.050 and 660-690 lift, somewhere around there, is probably where it will end up.

[eb02z06]

I find out what it is in it. Not sure right now. It is an off the shelf Comp Cams, I think it is the Comp 286HR... Once I switch over to the solid roller, it will be probably really similar to what you have...

258-264@.050 and 660-690 lift, somewhere around there, is probably where it will end up.


Bro-are putting the LSx in a foxbody?

[Suicidal Racing]

we both are..

mines going into a coupe and his car is a coupe also.

[eb02z06]

we both are..

mines going into a coupe and his car is a coupe also.

Awesome!!! Does someone make a drop in kit with motor mounts? What about headers?

[Suicidal Racing]

kooks make the headers,but you can use 351 headers and weld a ls1 flange on to them.

p.a racing makes the k-members along with,aje and another company..aje makes all the cross members so you can run any trans you want.

if u dont have a ton of cash you could just use a motor plate up front..thats what i'm doing..i think its just alot easier pulling a engine if it has a motor plate vs engine mounts.

[qwiknotch]

Awesome!!! Does someone make a drop in kit with motor mounts? What about headers?

Actually, mine is a 90 Silver Hatch, soon to be hot rod black :)
I will have an AJE k-member with drop spindles and the Kooks swap headers, 2inch with 3.5 collectors.
For $693, the headers are the buy of the century.

[Nmbr1GMfan]

[quote=Collinsautomotive;462557]i'm going with a hyd cam..of they had after market rockers for the L92s i would go solid then probley.

I think Jesel has an L92 rocker nearly out.

[Suicidal Racing]

Actually, mine is a 90 Silver Hatch, soon to be hot rod black :)
I will have an AJE k-member with drop spindles and the Kooks swap headers, 2inch with 3.5 collectors.
For $693, the headers are the buy of the century.

where u getting your headers from?

[qwiknotch]

I was told that the headers are that much. some dude posted the price on Ls1tech.com, he just bought a set

How much were you told they were?

[Suicidal Racing]

i aint seen a price for them.

your getting all that stuff for that price or just headers?

[qwiknotch]

Just the headers.....

[InTheRed]

LQ4 blocks are good to well over 1000hp, more if you do billet mains. The biggest problem is head lift over 25psi boost. L92's are great heads, especially when professionally ported, and the valves are swapped out. You should be able to make upwards of 1300hp or so with a setup like that fairly easily and reliably.

[Suicidal Racing]

Just the headers.....


not a bad price..i need to just get the L92 d port flage..i can get a set of long tubes off ebay used for a nice price and then just weld the flange on.

[qwiknotch]

I wish I knew how to weld because I would make the headers myself.

[NA$TY-TA]

LQ4 blocks are good to well over 1000hp, more if you do billet mains. The biggest problem is head lift over 25psi boost. L92's are great heads, especially when professionally ported, and the valves are swapped out. You should be able to make upwards of 1300hp or so with a setup like that fairly easily and reliably.


It doesnt even take 25 psi to start to lift the heads on the Iron block motors...
After a while i would start to push a lil water @ 20 psi.. not alot just a lil.... enought to preasurize the coolant system and push a lil out the over flow.
Ive done over 1100rwhp w/o Billit mains(my new motor has them)
This is with 317 casting 6.0L heads. and MLS gaskets.

My new motor is Iron still with the new World thick deck heads and O-rings.
Should make a lil more power this yr with a lil bigger motor and a lil bigger turbo.:smt077

Kyle

[95silverstallion]

kooks make the headers,but you can use 351 headers and weld a ls1 flange on to them.

p.a racing makes the k-members along with,aje and another company..aje makes all the cross members so you can run any trans you want.

if u dont have a ton of cash you could just use a motor plate up front..thats what i'm doing..i think its just alot easier pulling a engine if it has a motor plate vs engine mounts.
So the port spacing on the LS motors are the same as 351w? You only need a new flange to accomodate for the different port shape?

[Suicidal Racing]

from what i understand is yes,thats what people where doing before hooker made the swap headers for the lsx in a stang

[Collinsautomotive]

standard 1 3/4 round tube flanges work fine.



not a bad price..i need to just get the L92 d port flage..i can get a set of long tubes off ebay used for a nice price and then just weld the flange on.

[95silverstallion]

I'm contemplating doing a LSx in my Mustang in the future and have a set of 1 7/8 primary headers for a 351w. I'm not sure if I should sell them or hold onto them in case I can swap flanges and use them on a LS motor.

[Suicidal Racing]

i'm swaping flanges once i get a junk set of ebay headers..

i should have all the stuff to do my engine next week or the week after

[qwiknotch]

hmm... I have a set of 2inch 351 headers with a 9.5 deck.
Can I just buy the flanges and weld them on?
I am just wondering if I am better off just spending the $700 on Kooks headers.

[95silverstallion]

Seems like for the cost of about $40-50 for LS1 flanges it would be worth a shot. Worst case scenario you can just weld the windsor flanges back on if it doesnt work out.

What is the deck height of these LSx motors, 9.2?

[Suicidal Racing]

9.24

i got the idea from the ls1tech board..in the swap section

[qwiknotch]

Well, my headers are for the 9.5 deck. I don't want them sitting another 1/2 lower than they did before. This car is going to sit too low to have any more room underneath.

I'll call Kooks and order a set. :)

[DHR racecars]

Well, my headers are for the 9.5 deck. I don't want them sitting another 1/2 lower than they did before. This car is going to sit too low to have any more room underneath.

I'll call Kooks and order a set. :)
Why not just chop .5-.75 outta the tubes and raise them up a lil?????

[qwiknotch]

I can't weld for shit. Would have to pay someone to do all the work and at that point, for an extra couple of hundred, I can have the Kooks already ready for a fox swap and from what I hear, they sit pretty far up in the chassis.

[DHR racecars]

I can't weld for shit. Would have to pay someone to do all the work and at that point, for an extra couple of hundred, I can have the Kooks already ready for a fox swap and from what I hear, they sit pretty far up in the chassis.

True dat...
If you can't weld then it's just better to buy a set but phuck kooks.
When I asked who makes headers for the AJE clip in a nova they said "whoever you find that makes them.click" Phuck those assholes.:smt097

[qwiknotch]

wow.. .they have been nothing but cool to me when I have called.
Oh well....
Unless I can talk Robert V. into fixing them for me... I doubt it, he would rather just make his own set

[DHR racecars]

wow.. .they have been nothing but cool to me when I have called.
Oh well....
Unless I can talk Robert V. into fixing them for me... I doubt it, he would rather just make his own set

Thats what I had always heard also but when I called them I was like WOAH!!!

Phuck KOOKS!!!
More importantly PHUCK whoever it was that I talked to there!!!!!:smt097

[Suicidal Racing]

go to a good exh shop local and have them weld on the flanges..i called around local and i got 50-75$ to do it if i got all the parts..so for 250$ i got a set of headers

[95silverstallion]

9.5 deck compared to a 9.24 deck wont equate to lowering .26 though based on the angle of the heads. You might lower a 1/8".

Seems kind of risky paying big $ to get headers made to do a swap that isnt real common as of yet. Whats the odds any header is gonna fit real well first try?

[Suicidal Racing]

the kooks headers will seeing there made for the swap but i really think its just there 351 headers with the lsx flange on them if u ask me.

plus think if u can get a used stepped tube set and just weld the flange on your saving your self like 600$ 700$.

i know a guy on the ls1 board had a set he made for his swap and was selling them to make a newr bigger set because they where only 1 5/8ths

i'm looking for 2" header tubes seeing i'm plaining on hitting it with a 250-400 shot down the road once i get my bugs worked out.

[95silverstallion]

I have my 1 7/8" primarys from my 395w that i'm gonna weld the new flanges myself.

[GueSS Who ?]

I have a friend with a 99 Z06 that has a hydrolic roller 370ci aluminum motor with L92 heads ported by someone and a stock intake......It has the APS twin kit on it and it made over 850rwhp on pump gas.....turbos are done but I think he ordered bigger ones.

[njc.corp]

in the ls world- i honestly think the l92 is one of the best ls factory cyc heads out their for the money-

i also think such a big good head from factory needs some cubes behind it to take the full affect of it-

i don't know much about the l92 heads for turbo set-ups=but the talk is that it does not cut it in the thickness of the deck which imo is needed in a fi set-up-

as usual fiting a big head like this on a 4 inch bore is cam critical as their has been a lot of people getting it wrong and blaming the head-

my 2 cents-

[GueSS Who ?]

i don't know much about the l92 heads for turbo set-ups=but the talk is that it does not cut it in the thickness of the deck which imo is needed in a fi set-up-



my 2 cents-

My buddy is using L92 heads on his twin vet with ARP studs and cometic gaskets....Makes magombo power and hasn't ever lifted a head. Once again it is all in the tune...Stock heads are fine up to about 900 to the tires and then you start having issues.
This is the only person I know using the heads but they have been working for him.

[njc.corp]

My buddy is using L92 heads on his twin vet with ARP studs and cometic gaskets....Makes magombo power and hasn't ever lifted a head. Once again it is all in the tune...Stock heads are fine up to about 900 to the tires and then you start having issues.
This is the only person I know using the heads but they have been working for him.

well thats really good because i know others are starting to lift heads-maybe they are doing something wrong-

like i said i am only going by what i have seen and read-

whats the specs on your freinds l92 headed vet if u dont mind me asking-

[GueSS Who ?]

Aluminum 370 6.2L block 9:1cr
stock crank
Crowler rods
CNCed L92 heads (stock rockers)
LS7 or L92 intake with ported TB (not sure which one works)
APS kit with custom editing (stock PCM) (I think it is 18lbs)
Ram twin disk
stock rear and half shafts with no brace.

[GueSS Who ?]

BTW.......

Lingenfelter has been building motors with ported stock casting heads that make over 1K for years now. Pretty much the same exact kit as the APS. Some where 370s and others 427s.....John Page (21st Century) had a 346 that made up around 900 to the tires.