LT1-LT4 Modifications 1993-97 Gen II Small Block V8

LT1 to LT4 upgrade

Thread Tools
 
Search this Thread
 
Old Dec 6, 2007 | 04:46 PM
  #1  
Birdman305's Avatar
Thread Starter
Teching In
 
Joined: Sep 2007
Posts: 20
Likes: 0
From: Dade County 305
Default LT1 to LT4 upgrade

I wanna know is it worth it or is there a better package out there than the one offered by GMPP
Reply
Old Dec 6, 2007 | 04:51 PM
  #2  
Z28_FTW's Avatar
Teching In
 
Joined: Apr 2007
Posts: 10
Likes: 0
Default

There are many options that are a better value. Try searching.
Reply
Old Dec 6, 2007 | 04:57 PM
  #3  
infinitebird's Avatar
TECH Veteran
20 Year Member
Liked
iTrader: (11)
 
Joined: Jul 2004
Posts: 4,280
Likes: 51
From: Denver, CO
Default

^ what he said
Reply
Old Dec 6, 2007 | 04:59 PM
  #4  
Birdman305's Avatar
Thread Starter
Teching In
 
Joined: Sep 2007
Posts: 20
Likes: 0
From: Dade County 305
Default

Originally Posted by Z28_FTW
There are many options that are a better value. Try searching.
Like what do i look for? Im new to this stuff. Any suggestions?
Reply
Old Dec 6, 2007 | 05:22 PM
  #5  
Z28_FTW's Avatar
Teching In
 
Joined: Apr 2007
Posts: 10
Likes: 0
Default

Basically LT4 heads/intake are fairly high priced, especially considering stock castings ported will more than likely accomplish what you're hoping for. It all depends on what you are wanting to achieve. Are you just looking for a mild head/cam package?
Reply
Old Dec 6, 2007 | 06:03 PM
  #6  
96capricemgr's Avatar
11 Second Club
iTrader: (1)
 
Joined: Sep 2004
Posts: 11,975
Likes: 15
Default

Originally Posted by Birdman305
I wanna know is it worth it or is there a better package out there than the one offered by GMPP

you would be MUCH better off to have someone like Advanced Induction port your stock heads. Money wise and performance wise.
Reply
Old Dec 6, 2007 | 06:20 PM
  #7  
BADHAWK51's Avatar
10 Second Club
iTrader: (1)
 
Joined: Jan 2003
Posts: 1,516
Likes: 0
From: Chicagoland Area
Default

Buy a set of SBC heads like Brodix and a super vic intake and go fast.
Reply
Old Dec 6, 2007 | 08:55 PM
  #8  
Birdman305's Avatar
Thread Starter
Teching In
 
Joined: Sep 2007
Posts: 20
Likes: 0
From: Dade County 305
Default

Originally Posted by 96capricemgr
you would be MUCH better off to have someone like Advanced Induction port your stock heads. Money wise and performance wise.
I emailed them they havent got back to me yet...im tryin to achieve like 400-450 RWHP maybe even 5
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-4

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-5

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
Old Dec 6, 2007 | 10:47 PM
  #9  
Z28_FTW's Avatar
Teching In
 
Joined: Apr 2007
Posts: 10
Likes: 0
Default

Definately better ways to go about it than the GMPP LT4 kit...
Reply
Old Dec 6, 2007 | 10:52 PM
  #10  
rocket22's Avatar
TECH Regular
15 Year Member
iTrader: (2)
 
Joined: Jun 2006
Posts: 419
Likes: 0
From: Mo
Default

Afr has some great heads for Lt1 or port yours, and a lt1 intake ported can make just as much power.
Reply
Old Dec 7, 2007 | 05:33 AM
  #11  
The Engineer's Avatar
Launching!
 
Joined: Nov 2007
Posts: 271
Likes: 0
From: Moore Oklahoma
Default

If you want the best and don't mind spending the money, you could go with some AFR 195 LT4 heads (#1031) and a new Edelbrock LT4 air-gap intake. Then for a cam, one of the big Comp XFIs.

WD
Reply
Old Dec 7, 2007 | 07:02 AM
  #12  
96capricemgr's Avatar
11 Second Club
iTrader: (1)
 
Joined: Sep 2004
Posts: 11,975
Likes: 15
Default

Originally Posted by Birdman305
I emailed them they havent got back to me yet...im tryin to achieve like 400-450 RWHP maybe even 5
So you have a car with relatively few mods and you want to make that power on a stock shortblock????

Your a dreamer, get a clue and get reasonable expecatations and then look at modding the car more.

400+ is reasonable expectation on a stock shortblock these days, anything approaching 450 is NOT.

Also better to set et/mph goals than HP goals because dynos are not the track and results can vary between the two.

I think The Engineer deserves credit for his car's performance because the vast majority of results for the parts he is recommending are mediocre at best.
Reply
Old Dec 7, 2007 | 09:11 AM
  #13  
Birdman305's Avatar
Thread Starter
Teching In
 
Joined: Sep 2007
Posts: 20
Likes: 0
From: Dade County 305
Default

Originally Posted by 96capricemgr
So you have a car with relatively few mods and you want to make that power on a stock shortblock????

Your a dreamer, get a clue and get reasonable expecatations and then look at modding the car more.

400+ is reasonable expectation on a stock shortblock these days, anything approaching 450 is NOT.

Also better to set et/mph goals than HP goals because dynos are not the track and results can vary between the two.

I think The Engineer deserves credit for his car's performance because the vast majority of results for the parts he is recommending are mediocre at best.
I thought i said i dont know much before, and anything is possible!! Money moves mountains!!! Anyone else have POSITIVE COMMENTS or suggestions? What size cam is best 4 my application?
Reply
Old Dec 7, 2007 | 09:40 AM
  #14  
96capricemgr's Avatar
11 Second Club
iTrader: (1)
 
Joined: Sep 2004
Posts: 11,975
Likes: 15
Default

450rwhp NA streetable is not a reasonable goal on a stock shortblock no matter the money.

Your attitude here is going to have you listening to ignorant kids and leave you broke and disappointed. The guys who know what they are doing are going to tell you the TRUTH and while you may not like it it will be far more helpful and unfortunately many of them have given up trying to be heard through the ignorant masses.

Hell I am the only one to respond who has numbers in his sig to back up his opinions, that said The Engineer has a fast car. Not sure about the other guys but you can't be either since they list no info to back up their opinions.

If you insist on only POSITIVE COMMENTS then you are just hear to have your *** kissed and wont learn a damned thing.

If I were a vendor and I had some ignorant kid email me and say he wants 450+na out of a stock shortblock I probably would not waste me time to type a response, because your goals are way out of line and you lack the knowledge to make the right choices. Best thing you can do is not spend a dime at this point and LEARN what is possible and what it takes. Money is not the key to a fast car, KNOWLEDGE is, and once that is in place money certainly helps.
Reply
Old Dec 7, 2007 | 09:54 AM
  #15  
Platinum WS6's Avatar
TECH Enthusiast
iTrader: (6)
 
Joined: Aug 2005
Posts: 702
Likes: 2
From: Savannah, Ga
Default

First you will have to get rid of the lambo doors and 22's to save weight....you cant go fast on 22s man

i did an LT4 kit with the hotcam on one of my LT1 cars and was very dissapointed, I ended up with 338 rwhp and 361 rwtq and my best time was a 12.9 with drag radials and 3.73 gears in a M6 (it was a convertible WS6 though). I did the hooker LT's and all supporting mods. My friend did did the AFR 195's with a custom grind Futral Motorsports cam, all supporting mods and put down 380 hp and 360 tq but in a race couldn't beat my current TA with bolt on's b/c it only made 380 for a short band and he had to rev it to 6500 to get there. If you really are serious about going fast you are going to have to set the car up for it first, suspension, drivetain, then a forged stroker motor (ive seen some nasty 396 LT1s) with a good set of heads and pretty big cam and you can see 450 on motor then spray or boost for more.

To me it looks like you are more for looks than performance and that is fine but I am serious when I say you need to get rid of the 22s. The Lambo doors add a lot of weight also but I imagine it would be a pain in the *** to convert it back to normal. Just remember, lighter is better for every aspect of performance including cornering and braking. If you like the way your car is now and don't want to change it, buy another car and mod it for racing. Thats my $.02 and dont get offended about your current mods, they are just not performance pieces
Reply
Old Dec 7, 2007 | 11:40 AM
  #16  
kgkern01's Avatar
TECH Resident
20 Year Member
Photogenic
iTrader: (10)
 
Joined: Dec 2003
Posts: 996
Likes: 13
Default

I agree with everyone else on here. 400rwhp streetable or so is possible on 350 cubes with ported heads and good cam but if you want 450+rwhp streetable then you want to go to a forged 383 or 396 and good aftermarket heads and custom cam. 500rwhp and you're looking at boost, nitrous or single plane conversion.

The stock rear will also likely blow under the 400+ power. Hell, they can give out under stock power with sticky tires or bad wheel hop. So a 12 bolt or 9" rear is also needed.

22's on a sports car is about like having barbell weights for wheels. Get some wheels that are lighter and fit the car. Its your car, but if want power, those heavy things are holding you back even more maybe 5 to 10rwhp, not to mention anything over 18 or a few 19's just doesn't look right on these cars, they're supposed to have a low stance, not look jacked up in the air. To each their own though. For performance i would go 17 or 18's with 11" wide rears, light and wide is what you want.

Like everyone else says, first determine what the power is going to be used for and goals, then find the parts needed to get there. the highest dyno car is not always the fastest.
Reply
Old Dec 7, 2007 | 11:42 AM
  #17  
kgkern01's Avatar
TECH Resident
20 Year Member
Photogenic
iTrader: (10)
 
Joined: Dec 2003
Posts: 996
Likes: 13
Default

I agree with everyone else on here. The LT4 conversion is probably the worst $ per hp package out there. 400rwhp streetable or so is possible on 350 cubes with ported heads and good cam but if you want 450+rwhp streetable then you want to go to a forged 383 or 396 and good aftermarket heads and custom cam. 500rwhp and you're looking at boost, nitrous or single plane conversion.

The stock rear will also likely blow under the 400+ power. Hell, they can give out under stock power with sticky tires or bad wheel hop. So a 12 bolt or 9" rear is also needed.

22's on a sports car is about like having barbell weights for wheels. Get some wheels that are lighter and fit the car. Its your car, but if want power, those heavy things are holding you back even more maybe 5 to 10rwhp, not to mention anything over 18 or a few 19's just doesn't look right on these cars, they're supposed to have a low stance, not look jacked up in the air. To each their own though. For performance i would go 17 or 18's with 11" wide rears, light and wide is what you want.

Like everyone else says, first determine what the power is going to be used for and goals, then find the parts needed to get there. the highest dyno car is not always the fastest.
Reply
Old Dec 7, 2007 | 11:51 AM
  #18  
fast's Avatar
11 Second Club
iTrader: (24)
 
Joined: Jan 2003
Posts: 626
Likes: 0
From: Champaign, IL
Default

you need to define what you want out of your car

call/email as many vendors as you want (all of em lol)
get their input/recommendations
and go from there
Reply
Old Dec 7, 2007 | 12:13 PM
  #19  
Birdman305's Avatar
Thread Starter
Teching In
 
Joined: Sep 2007
Posts: 20
Likes: 0
From: Dade County 305
Default

The 22z arent an issue, cause i still have my stocks on drag radialsim just lookin for a lil go faster, so a head and cam package, a tune and a stall will do for now. I dont have any specific numbers that i wanna put down
Reply
Old Dec 7, 2007 | 12:33 PM
  #20  
WhyHelloOfficer's Avatar
12 Second Club
iTrader: (5)
 
Joined: Jul 2006
Posts: 583
Likes: 0
From: Tampa, Fl
Default

Originally Posted by Birdman305
The 22z arent an issue, cause i still have my stocks on drag radialsim just lookin for a lil go faster, so a head and cam package, a tune and a stall will do for now. I dont have any specific numbers that i wanna put down
So make a decision on you want out of the car are before you start throwing money at it.

That is what everyone has been telling you -- decide where you want to take the car, and then decide what would be the most intelligent and efficient way to go about it. It isn't rocket science -- the search function is your best friend. I gurantee almost every single question you'd ever think of asking has already been asked a handful of times.
Reply



All times are GMT -5. The time now is 12:11 PM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-4
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-5
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-6
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-7
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-8
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-9
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE