new engine or car????
Thread Starter
Instructor
Joined: Sep 2004
Posts: 210
Likes: 0
From: peoria il
new engine or car????
i have a 91 coupe (l98-250hp) 103k miles all stock everything else is in good shape. i want more power so do i upgrade my engine to a 383 or do i trade mine in on a 92 or newer(lt1-300hp). i wont do any of the work on my motor. i will have to pay labor costs for removel and install. what kind of hp will i get from a reg. 383. any info. will be great
thanks jeff
thanks jeff
Racer
Joined: Sep 2001
Posts: 396
Likes: 0
From: simi valley ca
Originally Posted by rugby!
i have a 91 coupe (l98-250hp) 103k miles all stock everything else is in good shape. i want more power so do i upgrade my engine to a 383 or do i trade mine in on a 92 or newer(lt1-300hp). i wont do any of the work on my motor. i will have to pay labor costs for removel and install. what kind of hp will i get from a reg. 383. any info. will be great
thanks jeff
thanks jeff
http://www.sdpc2000.com/
good luck,
joel
Burning Brakes
Joined: Nov 2003
Posts: 844
Likes: 0
From: Cape Cod Ma
If you buy that kind of engine your not going to see that advertized power with your stock tpi intake set up. All (most) of the gmpp crates are dyno'ed with a 4 barrel carb on them. Pretty much the only difference in the lt1's and the l-98's are the intake manifold.
You could have your stock engine done up at a local performance shop. Re-build it with a differnt cam shaft, port the cylinder heads, fully port the intake or buy an aftermarket pice, headers and a free flowing exhaust and that will make you alot faster than a stock lt1. You will be keeping your car, that you know won't turn out to be a lemon if you perchased a different car. And you'll have a fully rebuilt motor that could easily pass emmision testings that a built 383 couldn't do. Those are some options. I have a 350c.i. engine in my car. All forged internals, mini-ram intake so on..making alot more power than the gmpp383 would. You can get enough power out of a 350.
You could have your stock engine done up at a local performance shop. Re-build it with a differnt cam shaft, port the cylinder heads, fully port the intake or buy an aftermarket pice, headers and a free flowing exhaust and that will make you alot faster than a stock lt1. You will be keeping your car, that you know won't turn out to be a lemon if you perchased a different car. And you'll have a fully rebuilt motor that could easily pass emmision testings that a built 383 couldn't do. Those are some options. I have a 350c.i. engine in my car. All forged internals, mini-ram intake so on..making alot more power than the gmpp383 would. You can get enough power out of a 350.
Le Mans Master
Joined: Oct 2003
Posts: 7,625
Likes: 4
From: Director of Bands
St. Jude Donor '08
If it were me, I would sell the car you have and get one with the LT1. For the amount of $$$, time and energy you are going to spend on an engine swap, you might just as well move into another model year. Unless this is a labor of love. Then you're pretty much screwed 
. I would get another car because you should be able to re-sell your present car easier if it's in stock form. If you decide to do an engine swap and then decide to sell the car in a few years, you may have more trouble selling it because it doesn't have the original engine. Just my .02. 
. I would get another car because you should be able to re-sell your present car easier if it's in stock form. If you decide to do an engine swap and then decide to sell the car in a few years, you may have more trouble selling it because it doesn't have the original engine. Just my .02.
Drifting
Joined: May 2004
Posts: 1,536
Likes: 0
From: Bristol CT
This is just my opinion but if your willing to buy a newer car, an LT1 for 9 or 10k....i would say screw it...keep your car and get a 396 built and pop in some 3.55 gears and a Vigi 2800 tq converter....i'm sure you would be happy with that
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Well it depends on how much power you want:
-a stock LT1 will give you 300chp
-a lightly modified L98 will give over 300chp
-a heavily modified L98 will give over 375chp
-a stroked L98 should put you well over 400chp.
So decide on how much is enough, if you like your current Vette or ready for another one and go for it.
My stock L98 was rated at 240chp and with simple boltons it dynoed at close to 300chp. With heads, cam, headers and modified TPI intake it would top out at about close to 375chp.
-a stock LT1 will give you 300chp
-a lightly modified L98 will give over 300chp
-a heavily modified L98 will give over 375chp
-a stroked L98 should put you well over 400chp.
So decide on how much is enough, if you like your current Vette or ready for another one and go for it.
My stock L98 was rated at 240chp and with simple boltons it dynoed at close to 300chp. With heads, cam, headers and modified TPI intake it would top out at about close to 375chp.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by redfast
If you buy that kind of engine your not going to see that advertized power with your stock tpi intake set up. All (most) of the gmpp crates are dyno'ed with a 4 barrel carb on them. Pretty much the only difference in the lt1's and the l-98's are the intake manifold.
You could have your stock engine done up at a local performance shop. Re-build it with a differnt cam shaft, port the cylinder heads, fully port the intake or buy an aftermarket pice, headers and a free flowing exhaust and that will make you alot faster than a stock lt1. You will be keeping your car, that you know won't turn out to be a lemon if you perchased a different car. And you'll have a fully rebuilt motor that could easily pass emmision testings that a built 383 couldn't do. Those are some options. I have a 350c.i. engine in my car. All forged internals, mini-ram intake so on..making alot more power than the gmpp383 would. You can get enough power out of a 350.
You could have your stock engine done up at a local performance shop. Re-build it with a differnt cam shaft, port the cylinder heads, fully port the intake or buy an aftermarket pice, headers and a free flowing exhaust and that will make you alot faster than a stock lt1. You will be keeping your car, that you know won't turn out to be a lemon if you perchased a different car. And you'll have a fully rebuilt motor that could easily pass emmision testings that a built 383 couldn't do. Those are some options. I have a 350c.i. engine in my car. All forged internals, mini-ram intake so on..making alot more power than the gmpp383 would. You can get enough power out of a 350.
Really, about the only thing that the LT1 and the L98 have in common is internal rotating mass and basic block architecture. It is easy enough to bolt an LT1 in place of an L98, the only issue is electronics - and, for that matter, visa-versa.
It is for these reasons GM refers to the LT1 as a Gen II small block. The LS1 and such are Gen III small blocks.
