Can someone explain this LT1 rwhp voodoo..?

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Dec 16, 2003 | 10:45 PM

#31

rskrause

Moderator

Joined: Dec 1969

Posts: 10,745

From: Buffalo, New York

Quote:

Originally posted by chad_g69
my LT4 is streetable
LS1/6 was not available when i got my car
but im happy with what i got now
the downside - over $2500 in parts and $1500 in labor to get 438 RWHP with no boost and no juice (and still pass smog)

when engine was stroked to 427 (11/2003)
438 RWHP
509 Ft. Lbs. Tq
SAE corrected
65deg. F in dynoshop

when engine was stroked to 396 (05/2001)
368 RWHP
420 Ft. Lbs. Tq.
10:1 compression

when i 1st got car (stock LT4)
306 RWHP
340 Ft. Lbs. Tq.

all motor - no boost - no juice

here is what i got:

96 Z28 w/ Full 1LE package
96 GM LT4 4-bolt block, forged crank, rods, and pistons (keithblack pistons, 11:1 compression)
stroked to 427CI (7.0L) - yes it can be done just takes $$$
LT4 PCM, LT4 Heads, LT4 Intake, HOT LT4 Cam
ported/polished/decked/flowbenched heads w/ 3-anlge valvejob (275/260cfm@.600lift)
2.02/1.65 valves
airfoil
ported TB and intake manifold
1.7:1 rollerrocker arms
LT4 HEavyduty timing set
head stud kit
main stud kit
steel sleeved cylinders
block filler (needed due to the 4.125 bore/4.0 stroke to make 427CI)
high volume/high pressure oil pump
6QT oil pan
2800RPM Stall
A4 Trans w/ Stage2 rebuild
3.42:1 rear end limited slip gears
eibach springs on all 4 corners (1/2 inch lowered)
4inch y-pipe
4inch flowmaster catback (2chamber)
relocated IAT sensor
descreened Z06 MAF
K&N FIPK
dynotuned and PCM reprogrammed via LT Edit
140db of pure bas provided by 2 700watt amps, and some subs
Alipine head unit w/ XM, and DVD/MP3 6-disk changer
160deg. stat
5core radiator
Vette C4 brakes
TB Bypass
MSD 7AL-2
MSD COIL

Thanks to the following shops for assistance with this engine

Mark De Groff's Mark Cylinder Head Service - Northridge, CA
Valley Head Service - Northridge, CA
Burbank Speed & Machine - Burbank, CA
Bob's Engine - Reseda, CA
Balance Shop - Reseda, CA
West Valley Machine Shop - Chatsworth, CA
Bob Jennings Dyno Shop - North Hills, CA
THE DYNO SHOP - SANTEE, CA
A1 Transmission - Winnetka, CA

Very nice combo!

But it looks to me like your bottom end is not exactly "stock'. And one thing I don't understand: $4,000 in parts and laibor? What am I missing here?

Rich Krause

Last edited by rskrause; Dec 16, 2003 at 10:47 PM.

Dec 16, 2003 | 10:48 PM

#32

jonaddis84

Registered User

Joined: Oct 2002

Posts: 1,639

From: Toledo, OH

Excuse my ignorance, but the block being filled involves what, what I thikn of when I hear that is that all the coolant passages are filled in with material, but then what happens with cooling?

Dec 16, 2003 | 10:48 PM

#33

chad_g69

Registered User

Joined: Dec 2003

Posts: 45

From: San Diego, CA

Quote:

Originally posted by rskrause
Very nice combo!

But it looks to me like your bottom end is not exactly "stock'. And one thing I don't understand: $4,000 in parts and laibor? What am I missing here?

Rich Krause

before i hit 427CI
(when it was 396) it was 'factory'

as in GM parts

price includes stroking to 396
then restroking to 427
and the transmission work

i did the removal and re-install of the motor

Last edited by chad_g69; Dec 16, 2003 at 10:51 PM.

Dec 16, 2003 | 11:35 PM

#34

19formula94

Registered User

Joined: Jun 2003

Posts: 140

From: Phoenix, AZ

I dont know much about the H/C combo, but wouldnt you see better results with a bigger cam and higher flowing heads than the LT4 set up on a 427?

Dec 16, 2003 | 11:37 PM

#35

trax

Thread Starter

Registered User

Joined: May 2002

Posts: 611

From: Chicago 'burbs

Quote:

Originally posted by chad_g69
before i hit 427CI
(when it was 396) it was 'factory' as in GM parts

But those extra 46 cubes can mean a WORLD of difference in terms of power. Even a properly set up 355 can blow a stock bottom end out of the water.

BTW, Nice setup.

Dec 17, 2003 | 03:37 AM

#36

D-BoZ28

Registered User

Joined: Jul 1999

Posts: 42

From: San Jose, Killa Kali

Quote:

Originally posted by SS Mark
500 rwhp ls1?? Never heard of it through a stock cube motor, even some strokers. Speed Inc. made 515 with a 427ci NA in a Z06. 500 is definitley stretching it.
-Mark

this car

Dec 17, 2003 | 03:52 AM

#37

kmook

Advanced Tech Moderator

Joined: Aug 2001

Posts: 2,262

From: Nashville

Quote:

Originally posted by D-BoZ28
this car

That is stretching it. He made 478rwhp, so he has another 22 just to hit 500 let alone go past it. Yes he does have a few things left to try to get there, but that is squeeking ever last HP out of every aspect of the car... he even mentions running no belts to get more power which is pretty cheap imo...

Dec 17, 2003 | 08:02 AM

#38

OldSStroker

Registered User

Joined: Oct 2002

Posts: 2,931

From: Upstate NY

Quote:

Originally posted by rskrause
If it were easy, there would be a lot of people doing it.

Rich Krause

Yep, like trauma surgery.

Dec 17, 2003 | 09:42 AM

#39

Fastbird93

Registered User

Joined: Mar 2002

Posts: 4,827

From: Waynesboro, PA

I'm just curious how you stroked a LT4 to a 427.

As for head porters, who do we know of that consistently gets great results out of their work??

I can think of Joe Prince (don't go there, he's a great head porter

), and Lloyd Elliot. Those two consistently get good results with their heads. I know there's more out there. Chime in on this as it may be very useful to others.

Dec 17, 2003 | 09:56 AM

#40

jonaddis84

Registered User

Joined: Oct 2002

Posts: 1,639

From: Toledo, OH

It sounds like Phil @ AI does good work.

Dec 17, 2003 | 11:32 AM

#41

rskrause

Moderator

Joined: Dec 1969

Posts: 10,745

From: Buffalo, New York

Quote:

Originally posted by OldSStroker
Yep, like trauma surgery.

Right, just find the broken pieces and put them back together!

Dec 17, 2003 | 11:35 AM

#42

SS Mark

Registered User

Joined: Oct 2001

Posts: 282

From: IL

Quote:

Originally posted by D-BoZ28
this car

Link didnt work for me

Im curious to see what heads/cam setup he has and what trans/rearend he is running through.

Dec 17, 2003 | 11:35 AM

#43

neil350

Registered User

Joined: Apr 2000

Posts: 2,670

From: T E X A S

Quote:

Originally posted by 96-speed
Dyno queens. Lots of 450rwhp LS1s are runing 117-118mph.

The LT1 is weak compared to the LS1, but the LT1 can make ok power.

Ryan

Exactly, I had a buddy making 380 at the wheels, with heads and a 230/236 X.e cam in his 97 through an auto, car still trapped a cool 117.

Dec 17, 2003 | 11:54 AM

#44

Joes94TA

Registered User

Joined: Oct 2001

Posts: 401

From: VA

Quote:

Originally posted by rskrause
Right, just find the broken pieces and put them back together!

epoxy... a good head porters bandaid...

Dec 17, 2003 | 12:18 PM

#45

LeadSled1

Registered User

Joined: Feb 2000

Posts: 182

From: Earleville, MD

Here is 491rwhp through the mufflers.

http://www.ls1tech.com/forums/showthread.php?t=121977

The numbers will jump well over 500 when these heads are released by AFR:

http://www.airflowresearch.com/pages/205cc_mongoose.htm

70 cfm more flow with the same port size as a stock LS1 head. (300cfm @ 205cc vs 230cfm @ 205cc)

They are gonna cost $$$ for the first year or so but will be worth it.

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