Building my vz Cv8 427..

[427cv8]

My recent Head and cammed Ls2 conversion blew up due to a sh*t tune. (after about 8000km)

Car will now consist of, (getting built as we speak)

Cast iron lq9 (6lt block) stroker to 427ci, 4.065 bore with a 4.125 stroke, mahle flat top forged pistons, eagle crank and H beam rods, clevite bearings, Isky hydraulic roller lifters, 7.400 hardened push rods, 252ish/260ish cam (hear back today), 25% underdrive pulley, double row timing chain, Ported and polished L92 heads with stainless valves & double valve springs to a 650 lift, ls3 stock manifold with alloy OTR, bosch 60lb injectors and 044 bosch fuel pump, 4 into one pacemaker extractors, high flow cats, twin 3 in exhaust.

Other mods include,
Catch can, up graded radiator/oil cooler, tranny cooler, built auto with 3600 stall, solid alloy drive shaft, chromolly axels, 3.9 diff gears, harrop diff cover, nolathane bushes all round, koni adjustable shocks with lovell springs, 245/35/19 fronts and 275/35/19 on rear.

Brakes are definitely on the to do list!

Thunder performance are currently building the new motor and hoping to get it back by this sat or monday!

I'm hoping to come closeish to the 470-520rwhp mark and lotsss of torque.

Many people out there with a simular build? Any recommendations?

Pictures will come once I pick it up.

Adam

http://s1109.photobucket.com/albums/h432/aschaal/?action=view&current=monarotruck.jpg

[YOUR MATE]

Recommendation: Burnout.

[stumps.]

Will be a beast when its done mate. Lucky it has black tint so people cant see how ugly you are.

PICS
http://a3.sphotos.ak.fbcdn.net/hphotos-ak-snc4/36036_1518099150521_1175761857_31521111_3325089_n. jpg
http://a1.sphotos.ak.fbcdn.net/hphotos-ak-snc4/36036_1518099190522_1175761857_31521112_4845408_n. jpg
http://a4.sphotos.ak.fbcdn.net/hphotos-ak-snc4/36036_1518099310525_1175761857_31521115_7810410_n. jpg
http://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash2/34294_1518100910565_1175761857_31521122_7151576_n. jpg

[Turbo2.6L]

Who was original workshop you used?

[Tocchi]

Ps: still trying to figure out how to work out the site, I may struggle to reply! haha

welcome adam, if you have any issues at all trying to work it out, feel free to PM the "resident forum guru/newbie helper" .. he will be happy to help out.

>> http://www.antilag.com/forums/member.php?u=720

[SLY346]

Who was original workshop you used?

I wonder if they were Bibra Lake based?

[SSICK]

Recommendation: Burnout.

WCC member......burnouts frowned upon.

[stumps.]

Who was original workshop you used?

It was built in Queensland Monster performance?

[Daisy]

dude its a 427.

[TJ]

Burnouts definitely encouraged, just not near Denver.

[427cv8]

Correct Stumpie, yeah it was built over east. BADLY put together! Hopefully she will be all sweet this time around! I have tried to do everything right!

[427cv8]

WCC member......burnouts frowned upon.

Built for burnouts!

[regi]

Thanks Tocchi!

well played tocchi, well played

[YOUR MATE]

dude its a 427.

I see what you did there.

So pick it up Saturday and on fire by Sunday?
Just kidding, it sounds like a tough build, all the best with it. Chuck up some pics of the car and of the build if you're able to.

[AGIT8D]

I've been hearing about this build for a while, quietly pulling the strings in the background to get stumps to help you out :)

Should boogy mate. Have seen a fairly bombed 7L with Callies, ETP's etc go ~530rwhp through an M6. I think your rwhp is in the ball park.. I make ~470rwhp with a sedate 403ci (234/240 cam, mild heads) and M6.

Any confirmation Craigs built the box? That's the only chance I see of it holding up to the abuse :) Enjoy it bud, hopefully you make the next RAC driver day.

[Turbo2.6L]

dude its a 427.

Hahaha
"Dude, i'd eat that thing for breakfast!"

[427cv8]

Will be a beast when its done mate. Lucky it has black tint so people cant see how ugly you are.


I've been hearing about this build for a while, quietly pulling the strings in the background to get stumps to help you out :)

Should boogy mate. Have seen a fairly bombed 7L with Callies, ETP's etc go ~530rwhp through an M6. I think your rwhp is in the ball park.. I make ~470rwhp with a sedate 403ci (234/240 cam, mild heads) and M6.

Any confirmation Craigs built the box? That's the only chance I see of it holding up to the abuse :) Enjoy it bud, hopefully you make the next RAC driver day.

Cheers man,
Yeah stumps has been pissing in my ear! haha. I was gonna just go with a stock rebuild but it has been stepped up a notch with a stroker.
I would be stoked to crack the 500rwhp mark!
What heads are your running? L92?
Once it is up and running stumps and I will be organising a RAC track day for sure.
I was meant to be in the last one but threw a piston a couple of days before!

I cant remember who did the box now. It wont come as a great suprise if i destroy a box, i have had sh*thouse luck with cars over the years! May have something to do with how hard i drive them?

[Tre-Cool]

fyi, the ls2 blocks wont make 427ci unless you re-sleeve it. but then your better to start with an ls7 or aftermarket block.

i'd also look at flogging off the auto while it's working, coz it wont handle the power for very long.

[goodie]

welcome adam, if you have any issues at all trying to work it out, feel free to PM the "resident forum guru/newbie helper" .. he will be happy to help out.

>> http://www.antilag.com/forums/member.php?u=720

FUCKING LOL

[4A10SHN]

fyi, the ls2 blocks wont make 427ci unless you re-sleeve it. but then your better to start with an ls7 or aftermarket block.

i'd also look at flogging off the auto while it's working, coz it wont handle the power for very long.

Must be one of them magical 427ci LS2's....

[427cv8]

Its a cast iron block so no need for the re sleeve (Lq9 block) same as alloy ls2 block only cast iron i've been told. it is a 4.065 bore with a 4.125 stroke. The short block is already been built and assembled.

yeah i will give the auto a run and see how it goes, i dont have huge expectations but can only wait and see. If it goes a 6pd conversion will be on the cards.

[shane]

I wouldnt go that big with the cam if your thinking of changing to a manual, it will be a pig to drive.

[427cv8]

Cam is the only thing that hasnt been purchased yet. My last cam was 242/244/112. I was told today i should upgrade to larger by Thunder. I still have to talk to them tomorrow about what cam spec to go with. I will run it by them that i might become a manual.
Cheers for the heads up

[Tre-Cool]

Cam is the only thing that hasnt been purchased yet. My last cam was 242/244/112. I was told today i should upgrade to larger by Thunder. I still have to talk to them tomorrow about what cam spec to go with. I will run it by them that i might become a manual.
Cheers for the heads up
I'm with shane on this one, I reakon stick with your current cam. that's still plenty big enough for a 427 and you save yourself a few bucks.

i only run a "measly" 232/238 @ 112 in my 402. it sit's behind a t400 in my drag car but even when i had the manual behind it, it happily sat idling at 900rpm and was heaps better in drivability than the 235/245 come racing cam it was originally built with.

[427cv8]

I'm with shane on this one, I reakon stick with your current cam. that's still plenty big enough for a 427 and you save yourself a few bucks.

i only run a "measly" 232/238 @ 112 in my 402. it sit's behind a t400 in my drag car but even when i had the manual behind it, it happily sat idling at 900rpm and was heaps better in drivability than the 235/245 come racing cam it was originally built with.

Cheers for that, I'll definately take it on board. It will be a semi daily driver so it needs to half decent to drive.

[KAL SPL]

You mean theres a car coming out of Thunder without an 8/71 !

[Sfidz]

welcome adam, if you have any issues at all trying to work it out, feel free to PM the "resident forum guru/newbie helper" .. he will be happy to help out.

>> http://www.antilag.com/forums/member.php?u=720

LOL, i see what you did there.

Looks like good build in the making dude.

[427cv8]

WCC member......burnouts frowned upon.

Not a member, they just took the photo.

[AGIT8D]

These guys are on the money with the cam.. If you do switch back a 25x/26x will be monstrous. Fine for Sunday driving and beating up on if you want to spend all your time half way up the techo and above.. No good for semi-daily duties.

Like I said mine's a 234/240 which some guys use in LS1's (346ci vs 403ci) but it gives me excellent mid-range and makes it manual friendly.

Mid 240's would be great on yours, or low 250's at a maximum - like KPWISHN had in his LS7 (but with BIG heads).

My heads are L92, yeah, they've been cleaned up to rid the cast marks but no real porting etc. Keep us updated on how this goes, it should be a good package. I hope you get a well built/tuned car!

[427cv8]

These guys are on the money with the cam.. If you do switch back a 25x/26x will be monstrous. Fine for Sunday driving and beating up on if you want to spend all your time half way up the techo and above.. No good for semi-daily duties.

Like I said mine's a 234/240 which some guys use in LS1's (346ci vs 403ci) but it gives me excellent mid-range and makes it manual friendly.

Mid 240's would be great on yours, or low 250's at a maximum - like KPWISHN had in his LS7 (but with BIG heads).

My heads are L92, yeah, they've been cleaned up to rid the cast marks but no real porting etc. Keep us updated on how this goes, it should be a good package. I hope you get a well built/tuned car!

Cheers mate,
I think the guys already went ahead and ordered the cam. its a 252 im pretty sure. They are confident it will be half decent at that size as they have just build the identical motor with the same cam. It pretty much is a sunday car and after work car, I have my 1.4l van as a run around haha.
Hopefully catch ya soon at a RAC day! cheers again

[stumps.]

Seems a lot of guys in the states are running a cam like that with the 7l. Not that hard to change it later anyway if you don't like.

[KPWISHN]

Yeah my 427 had a similar size cam to your first one. M6. Major problem was snapping axles, driveshafts and tailshafts and generally just flogging the shit out of everything on the car. Now have got rid of anything unnecessary that might break and swapped to a T400 and a spooled 33 spline setup same as Shane.

Fun times ahead for you. Hard to beat the sound and go of a big cubed LS. Looking forward to getting mine on the road again too. Will be a good 300-400kgs lighter this time too. :)

[Yakky Bear]

. Hard to beat the sound and go of a big cubed LS. Looking forward to getting mine on the road again too. :)

as much as a diehard jap fan that i am, i totally agree.

[427cv8]

Yeah my 427 had a similar size cam to your first one. M6. Major problem was snapping axles, driveshafts and tailshafts and generally just flogging the shit out of everything on the car. Now have got rid of anything unnecessary that might break and swapped to a T400 and a spooled 33 spline setup same as Shane.

Fun times ahead for you. Hard to beat the sound and go of a big cubed LS. Looking forward to getting mine on the road again too. Will be a good 300-400kgs lighter this time too. :)

Hey mate, cheers
Are u still running that cam or have you gone down a size?
Drive shafts axels etc have been upgraded but i dont have high hopes for the gear box..
What car are u running your set up in?
Thanks for your input!

[AGIT8D]

Hey mate, cheers
Are u still running that cam or have you gone down a size?
Drive shafts axels etc have been upgraded but i dont have high hopes for the gear box..
What car are u running your set up in?
Thanks for your input!

Just as a brief background on KPWISHN's car.. The setup was in a VX Clubby and he upgraded the CV's etc to the 'unbreakable' billet jobbies which are about $800ea (back in the day). Went to Motorvation, dropped a big skid and tore one apart, with the other showing twisted splines/teeth as well.

You might already have the Gforce1320 gear in your Monaro, but if not it could be worth looking into if you go manual. I think you'll put less stress on the drive train with the auto, but it might not go the yards. The Gforce gear is what KPWISHN refers to for his new setup (VX Berlina), and the same as shane has in the drag ute.

[KPWISHN]

Cam size is the same atm but the motor has been sitting dormant for two years. Will see how much cash I have when the time comes to put the motor back in. The car will be more a race car I can street, than a street car I can race if you know what i mean. So the cam size will be larger for sure. :)

As for axles etc, yeah I ran many different types. Stock, cheap shit and expensive ones and they all broke. All were 28 spline ones though and have since got the GForce1320 33 spline set up with substantially bigger driveshafts.

Car will be run in Super sedan SS/A and SS/AA i guess if i chuck a couple of T51R's on it.

[Tre-Cool]

and SS/AA i guess if i chuck a couple of T51R's on it.

Where's the "Like" button....

Touch wood, im still running the original 140K km old stubs,axles in my vy ute and some v6 shafts out of a wreck for my drag car.

[DVLSAVOC8]

Awsome build mate. looking forward to seeing what it makes once its put back in the car :)

[stumps.]

Pics on first page

[427cv8]

Still waiting to get it back, next week so they say. Fast fuel rails also purchased. Cam spec is 256/270 Just need to be droped in and tuned. Bring it on!

[KPWISHN]

That's a MAN CAM!

[Tre-Cool]

wow, thats not gonna be a fun sized car to drive. long stroke means it's not gonna want to be revved very hard.

i'm going to be building a new stroker very soon but only going with a 3.8" stroke with 4.130" sized pistons.

[427cv8]

Picking up car tomorrow if all goes to plan.. 1 week has blown out to 5 weeks.. good times.

[AGIT8D]

Picking up car tomorrow if all goes to plan.. 1 week has blown out to 5 weeks.. good times.

It always does on stuff like this mate, for whatever reason. Took me 2 years to put my motor in my car..

Hopefully it works sweet as a package and that auto lasts long enough for you to get used to the sheer awesome! :D Any idea who Thunder were getting in to tune it?

[427cv8]

Car is due back tomorrow now. Car was getting tuned last week, mid way through the tune the gear box let go. They were at the 440rwhp mark when it happened with more power to pull out. Gone for a built auto after playing with the idea of converting to manual. Also had the stally recond while it happend. New box should be pretty tough and it comes with a nice warranty.

[Turbo2.6L]

How much to build 4l60e?
Did you consider a TH400??

[427cv8]

How much to build 4l60e?
Did you consider a TH400??

the new box fitted cost me about $2400. thats pretty well fully bombed they recon and willing to give at least a year warranty on it. Pretty fair if you ask me.
T400 would def be a tough option, worried it maybe a bit of a pig for daily driving?

[427cv8]

thats a complete new box too, so i will get my old one back and attempt to get it fixed.

[AGIT8D]

the new box fitted cost me about $2400. thats pretty well fully bombed they recon and willing to give at least a year warranty on it. Pretty fair if you ask me.
T400 would def be a tough option, worried it maybe a bit of a pig for daily driving?

Yeah pretty much if you had aftermarket diff gears you might as well say goodbye to freeway driving with a turbo 400.. But my oh my would it stand on the tyre in top gear on the freeway hahahaha!

Who did the new box for you?

Always these sorts of hiccups in a build of it's calibre. You toughen up some components and the next weakest link packs it in. I hope it's the last of the dramas for a little while and you can get it tuned and out on the road to punish some rubber

[AGIT8D]

How much to build 4l60e?
Did you consider a TH400??

Are you chasing a built 4L60?? May I recommend Craig's Autos in the Eastern states before you play around with them too much over here.

[427cv8]

Thunder have sorted a box for me that they will stand behind and will give warranty on. Hope that will be it for a little while and i can drive the f*cker. Its been a solid 8 months!

Yeah i though the t400 would be more just a strip box than a daily driver

cheers

[KPWISHN]

So how does it go?

[AGIT8D]

Not sure if he has taken delivery yet.. Most of the tuning was done but the box wasn't talking to the PCM properly or something.

[stumps.]

Yeh still at shop

[427cv8]

Not sure if he has taken delivery yet.. Most of the tuning was done but the box wasn't talking to the PCM properly or something.

Yeah thats right, been alot of messing around. I would think it would be done today.. The car is running and tuned etc, just waiting on the glitches to be sorted. New pcm fitted so its all running smoothly, they just wanted the tuner to test drive it and check it over. Fingers crossed

[mys1]

BURNOUTS BURNOUTS BURNOUTS!!!!!!!

[427cv8]

Car is ready. Picking it up in a couple of hours. BURNOUTS NOW

[AGIT8D]

Pics better load!

[PSI 304]

+1

[patty]

Videos better load!
Edited for ya :)

[Tre-Cool]

I predict broken gearbox within the first week/month.

4l60 will cry foul and die

[stumps.]

New box has a warranty, its already done one on the dyno. I suspect it is a 4l65e hence the need to recalibrate the pcm.

[Tre-Cool]

we just changed out a 60 to a 65 in my dads ute. there is nill software changes required.

if it had a good box in it before and broke, changing to a 65 probably wont make much difference in the long run.

"An updated 4L60-E, the 4L65-E (RPO M32), was phased in around the 2003 model year when coupled behind the 6.0 Vortec. Five-pinion planetaries, along with a higher capacity input housing and induction hardened input shaft assembly, were improved to withstand up to 380 ft·lbf (515 N·m) of torque. A new 300mm torque converter with improved higher-capacity internals was also introduced on select engine models."

Now if it were a 4l80, then yeah it would require a mixed os/tcm change to be done.

4l80's are the shit apparently when it comes to high horsepower/torque cars, there essentially an electric turbo 400 with an overdrive.

[stumps.]

Ahh, well the stats of the new box look the goods, I doubt they would put a guarantee on the box if they thought it was going to break.

As mentioned earlier in the thread the engine and gearbox were put in by a workshop in QLD and were supposed to be the best (previous owner). The 6L lasted 8k before detonation, so it could be fair to assume whoever built the old box had no clue as well.

Non the less being negative when a guy is finally getting his car after 8 months of not driving it doesnt help anyone.

Good luck with the car mate, can't wate to see it running again.

[Tre-Cool]

i didnt mean to be negative, just a fact of life that the 4 speeds are useless once you start putting a serious amount of power into them and start doing skids or racing them.

[ASSASIN]

Ahh, well the stats of the new box look the goods, I doubt they would put a guarantee on the box if they thought it was going to break.

As mentioned earlier in the thread the engine and gearbox were put in by a workshop in QLD and were supposed to be the best (previous owner). The 6L lasted 8k before detonation, so it could be fair to assume whoever built the old box had no clue as well.

Non the less being negative when a guy is finally getting his car after 8 months of not driving it doesnt help anyone.

Good luck with the car mate, can't wate to see it running again.

If its an RVO Box i have seen 3 go in the same car in as many months

[427cv8]

Car is back at home and running like a pig. Just changed the front oxygen sensors with stumps57L's help getting the c*nt of the things out. Still running terrible. Assume the rears are gone... I will be calling the shop tomorrow morning and having a good whinge. Drove excellent for half an hour then started playing up big time..

Box is a built 4l65e

[AGIT8D]

Got a fuel pressure reg? Might be busted and over fuelling. Happened on mine.

Rip out one of the plugs for a look as well.

[Tre-Cool]

i wouldnt worry about the oxygen sensors it's highly unlikely the car would be running with them giving feedback to the ecu, especially due to the cube and camshaft in use.

(you can turn them off/on in the tune)

[427cv8]

The shop recomended the LH oxygen sensor, they replaced the RH one because of the same problem.. still 2 more rears that havnt been changed.
I'll pull the plugs out tomorrow and have a look, cheers Dan.
I guess its just a work through and eliminate things to find the problem.
Might have to get the shop to turn the sensors off to see if its the actual problem..
cheers for the input boys, hopefully its a petty little problem

[stumps.]

Had to take the header off to get the rounded o2 sensor out. Stilsons and two guys, it was in there good. I thought it would be in closed loop but thunder recommended this is what we do. I can see why they only changed one.

Let's see how they handle this tomoz

[AGIT8D]

^^ Hahaha yeah I bet you can see why.. My tune is only set to use o2 at idle I think? So once it comes off the idle map they are null and void. Makes it easier to eliminate them as the source of breaking down... Pretty sure that's how mine is done. I'd be surprised if they were using the o2's a lot during the tune, from my VERY brief readings and understanding that was a bit of an older school method now days.

Hopefully you boys sort it today. I'd just pull the front plugs if you want to do it quickly, but I guess if you've ripped the headers off now you may as well check the ones at the back too, see if they are fouled up. Also check what plugs they are using.

Does this have a fuel system? Might be worth checking the pressure it's running. My reg lasted no time at all.

[stumps.]

Yeah fuel system is running. The car runs, but pops and farts, and idle is up and down. This happened with my car after the cam install. But steve tuned it closed loop until i got some new sensors.

So frustrating

[PSI 304]

Merely teething problems, you will no doubt encounter a couple more of these before its where you want it. Isnt going to be 100% right out of the shop, we all hope they are but 9 times out of 10 there will be minor adjustments needed before its running schmick.

Hopefully she's running sweet soon for BURRRRNOUTS! :)

[stumps.]

How does the 5L go with the charger? does it have a power figure?

[PSI 304]

Definately no animal, but a bucket of fun. 331rwhp, 751nm. Might do a showcase for it sometime instead of boring others with the details in a 427 build thread lol

[427cv8]

Well it's all running sweet. Sensors did the trick! I will get some photos up soon.

pretty lucky for the car it started running nice, i think it would of encountered a few rage dents if it didnt go my way lol.

Any of you guys running oil coolers? Did you find it dropped your oil pressure slightly? wondering if mine is actually worth it as it is runs through my radiator. Also what pressures are you guys running at warm idle?