Forged Iron 370 / AFR 225's / Truck Manifolds / PT88

[98Z28CobraKiller]

I was waiting until it was close to completion in order to start the build thread. This build is really just part 2 of my original stock longblock Lq9 build. All the fabrication is in the other thread.
LQ9 6.0L PT88 w/ Truck Manifolds in an FBody Build w/ Pics

Here are details on what the build will consist of:

LQ9 370 ci Iron block (.030 over)
Stock Crank
Childs & Albert Forged 6.125 rods
Wiseco K392X3 Forged 25cc dish
Livernois Stage 2 Cam (232/232 .595/595 114)
AFR 225 CNC ported w/ some additional bowl work by Mamo
FAST 90 Intake
NW90 TB
Forward facing 6.0 Truck Manifolds
2.5" mandrel bent hot "Y" into T4 flange
Precision PT88 Turbo with .96 A/R T4 Exh Housing
4" Mandrel Exhaust into 4" Magnaflow bullet
24"X12"X6" Bellcore A2A Intercooler

Fueling is handled by:
80# High Imp Inj
Aeromotive BRFPR
MagnaFuel 4301 Fuel Pump
-10 feed and stock feed line as return

Engine Management:
Stock 98 PCM w/ HPTuners 2 Bar Custom OS in Speed Density

PT88 Turbo





Intercooler

[98Z28CobraKiller]

Pistons

[87silverbullet]

You are my motivation to put my car together. I have been watching your build from when you first put it together with the stock 6.0. Good luck with the build.

Will we see some 9's this time?

[98Z28CobraKiller]

I had to have 4 valves replaced in the AFR heads and have them milled after my nitrous assisted 408 came apart. The ringland broke on the piston and really gave the quench area of the head a beating. Engine builder assured me that the small amount of pitting left in the quench area would'nt cause any problems. This was the #7 hole. I am moving it to #2 so that I can keep a close eye on it.

[98Z28CobraKiller]

Originally Posted by 87silverbullet

You are my motivation to put my car together. I have been watching your build from when you first put it together with the stock 6.0. Good luck with the build.

Will we see some 9's this time?

Shooting for 8.90's.

[ChevyChad]

Nice. Your engine setup looks very similar to mine. Of course, you are turbo, and I'm procharged, but I'm definitely interested in seeing numbers from your setup- both on the dyno and on the track!

BTW, what size cc are your heads now after the milling? Just tryin to figure out your compression..

[98Z28CobraKiller]

Great question and my answer is, I'm not sure. They were purchased at 65cc. Then they got cut to 63cc when they went back to AFR for the valve recall, upgraded springs, and the bowl work. This time around, they milled them as little as possible to make them perfectly flat per my request. I'm thinking 61-62cc which should put me just under 9:1.

[ChevyChad]

Ah gotcha.. Yea, we have similar compression too. Mine were initially 72cc, but have been surfaced a couple times, and are now about 70. My pistons are wiseco -11cc though, which puts mine at about 9.2..

What trans are ya running?

[Tony Mamo @ AFR]

Originally Posted by 98Z28CobraKiller

Engine builder assured me that the small amount of pitting left in the quench area would'nt cause any problems. This was the #7 hole. I am moving it to #2 so that I can keep a close eye on it.

Just some "battle scars" Carlos and I agree that they wont cause any issues.

Purely cosmetic assuming you deck the head clean and straight as you obviously did.

Looking forward to the numbers when its all back together!

Cheers,
Tony

[GMCtrk]

how laggy is that PT88 going to be on the 370?

Also, more or less a pet peeve, there's no such thing as 6.0 manifolds. 4.8, 5.3, 6.0 manifolds are all identical. Everything externally on those motors is identical.

[HUNTER02SS]

This setup is almost identical to my friends old car. His ran in the 5.80's in the 8th., unfortunatly he never ran the 1/4. Same heads, CI, and turbo, and he had a th400 as well. Not sure what you are expecting , but you should be in this range.

[RS_SS69]

Looks nice, what weight are you currently at? Are you planning on anymore weight reduction? Are you going to max out the t4 with the new setup.

[ninetres]

Originally Posted by GMCtrk

how laggy is that PT88 going to be on the 370?

Also, more or less a pet peeve, there's no such thing as 6.0 manifolds. 4.8, 5.3, 6.0 manifolds are all identical. Everything externally on those motors is identical.

Actually there is such a thing. The 6.0 mainfolds are ones that came off of a GM 6.0 truck engine. Just cause they are available on another engine doesn't make the label 6.0 manifolds wrong.


And nice build. Should run hard. Its a lot like my set-up with a slightly bigger snail. Do it all right and you should be able to go 8s.

[cablebandit]

those pits will get filled in by carbon. No worries...been there done that. Should be a good running combo....a little more compression would be nice but spool should not be a problem

[98Z28CobraKiller]

Originally Posted by ChevyChad

Ah gotcha.. Yea, we have similar compression too. Mine were initially 72cc, but have been surfaced a couple times, and are now about 70. My pistons are wiseco -11cc though, which puts mine at about 9.2..

What trans are ya running?

Launch control comes from:
TH350 w/ RMVB and TBrake (I've been 9.33@146 on this trans with my 408 nitrous motor so its seasoned and strong)
FTI 4500 stall
LNC-002 2 step
AMS-500 Boost controller (may add CO2)

Originally Posted by Tony Mamo @ AFR

Just some "battle scars" Carlos and I agree that they wont cause any issues.

Purely cosmetic assuming you deck the head clean and straight as you obviously did.

Looking forward to the numbers when its all back together!

Cheers,
Tony

Makes me feel better. Thanks for all the help over the last few years!

Originally Posted by GMCtrk

how laggy is that PT88 going to be on the 370?

Also, more or less a pet peeve, there's no such thing as 6.0 manifolds. 4.8, 5.3, 6.0 manifolds are all identical. Everything externally on those motors is identical.

I ran it on the bone stock LQ9 long block for a while. Most of that time, I had the short runner carbon fiber intake on it. It would full spool by 5K RPM which wasn't horrible as my converter was stalling to about that at full (14-15 psi) boost. At some point during the time that I was boosting it, I developed a hairline crack that almost drove me insane trying to find. I ended up glueing my FAST together and throwing it on. Dropped the full spool RPM almost a full 1K RPM. That was then with stock 317 heads and the stock LQ9 cam. I would think that with the new cam and heads, it'll be even easier to spool and make close to 200 hp more at the same 15 psi boost level.

Originally Posted by HUNTER02SS

This setup is almost identical to my friends old car. His ran in the 5.80's in the 8th., unfortunatly he never ran the 1/4. Same heads, CI, and turbo, and he had a th400 as well. Not sure what you are expecting , but you should be in this range.

I managed to peel off a 6.32 @ 109.5 in the 1/8 with stock everything the night that I blew it up.

I think I need a 5.70 to go 8.90. We will see.

Originally Posted by RS_SS69

Looks nice, what weight are you currently at? Are you planning on anymore weight reduction? Are you going to max out the t4 with the new setup.

Should be at about 3700 lbs. After I get everything working solid, I'll start seeing if I can get some weight out.

Originally Posted by ninetres

Actually there is such a thing. The 6.0 mainfolds are ones that came off of a GM 6.0 truck engine. Just cause they are available on another engine doesn't make the label 6.0 manifolds wrong.


And nice build. Should run hard. Its a lot like my set-up with a slightly bigger snail. Do it all right and you should be able to go 8s.

That's the plan.

[98Z28CobraKiller]

Originally Posted by cablebandit

those pits will get filled in by carbon. No worries...been there done that. Should be a good running combo....a little more compression would be nice but spool should not be a problem

I didn't want to get into a custom piston setup plus you guys wouldn't believe what I paid for these pistons and rings. I basically had to go "off-the-shelf" to get the deal. Next step up would have put me too high and I want to be able to run 93 oct for consistant 9.50's.

[cablebandit]

Originally Posted by 98Z28CobraKiller

I didn't want to get into a custom piston setup plus you guys wouldn't believe what I paid for these pistons and rings. I basically had to go "off-the-shelf" to get the deal. Next step up would have put me too high and I want to be able to run 93 oct for consistant 9.50's.

im using off the shelf wisecos as well. I wouldnt be trying this on 93 octane...but thats just me.

[98Z28CobraKiller]

Originally Posted by cablebandit

im using off the shelf wisecos as well. I wouldnt be trying this on 93 octane...but thats just me.

9.50's on 93 oct with about an 8.8:1 SCR ? Doesn't seem difficult. I ran a bunch of 10.0's @ 14 psi with 10:1 compression stock longblock. Detonation didn't kill it. Stretched rod bolt killed it.

I'll need 116 to run the 20+ psi required for the 8.90 pass.

[cablebandit]

anxious to see how thus works out.

[Turbo LS1 SS]

it will be fast! hold on