[Dajerseyrat]

I have a fairly stock LT1 engine in my car that was swapped in before I got it. It moves pretty good and has headers and an MSD ignition. I dont know what type of car it came out of or what HP it was..My questions are as follows..

1)How do I tell which model LT1 it was by looking at it. (HP and TQ)

2)what are the HP limits to a stock LT1?

3)what modifications are proven and needed to make around 450hp if possible?

[DoubleVision]

Which LT1? The 70`s or the 90`s? If it`s the 70`s we need to know which LT1 it is, the high performance version or the smogger version. If it`s the 70`s version which heads does it have on it? The easiest way to get the power level you want is by more cubes. Going up to a 383 is a step in the right direction.

[turbolover]

If its the newer gen II LT1 then you can get 450 driveable wheel horsepower with a 383 stroker kit, cam and valve train upgrade, head and intake porting, and new injectors and tuning.

[Dajerseyrat]

Its probably out of a newer car pre OBD2. I found the ECM and it is the Chip type of ECM. I got the following part numbers off it 88999183 and Lc21-4307-DCA3328

[Siggy_Freud]

The early 90's LT1's came with 275-300hp and 325-330ft lbs of torque depending on what they were in.

The F bodies has the lower power ranges and the Corvettes had power in the higher range.


Stroking it with cams/heads would be a good way to 450hp. Or using forced induction would get you there rather quick on ~5-6lbs of boost.

[Dajerseyrat]

Originally Posted by Siggy_Freud

The early 90's LT1's came with 275-300hp and 325-330ft lbs of torque depending on what they were in.

The F bodies has the lower power ranges and the Corvettes had power in the higher range.


Stroking it with cams/heads would be a good way to 450hp. Or using forced induction would get you there rather quick on ~5-6lbs of boost.

What about tuning options?? I think the ECM is an OBDI and is an AC Delco remanufactured one..

[turbolover]

Originally Posted by Dajerseyrat

What about tuning options?? I think the ECM is an OBDI and is an AC Delco remanufactured one..

SAve yourself the trouble and just go Megasquirt, if you get a preassembled one its pretty much idiot proof- assembling one yourself is time consuming though.

[Dajerseyrat]

Originally Posted by turbolover

SAve yourself the trouble and just go Megasquirt, if you get a preassembled one its pretty much idiot proof- assembling one yourself is time consuming though.

I would rather not..

[turbolover]

That's fine but better systems are going to cost you significantly more.

[Dajerseyrat]

Originally Posted by turbolover

That's fine but better systems are going to cost you significantly more.

Rather use the stock ECM..

[turbolover]

I think the ECM is an OBDI and is an AC Delco remanufactured one.

[cobalt327]

Originally Posted by DoubleVision

Which LT1?

DV, you know this, I'm sure- but just in case someone else may be wondering:

The LT-1 was the '70's performance engine.
The LT1 was the Gen II engine w/reverse cooling, etc..

Unfortunately, there's no guarantee that "LT1" won't be used when "LT-1" is meant, and vice versa. But IF used correctly, the two ways of writing it will designate which engine is being referred to.

[DoubleVision]

Yeah Cob, I`m aware of the differences, only in most cases I`ve seen few bother to put the dash between the LT and the 1 as you mentioned. They would say however, if it were computerized or not and that right away gave it away, since he didn`t mention it, and headers and a MSD on a newer LT1 are down right rare, so I had to ask. Sorry if that was my bad. I`ve eye balled LT1`s in the junkyard and thought seriously of adapting one in my 92 chevy pickup, the other thing that bothers me about it is setting it up for reverse flow cooling, then figuring out the maze with the Air Conditioner routing. But, it would be nice to have the stock LT1`s horsepower and drivibility.

[Dajerseyrat]

Guys, no one is testing your knowledge of the correct LT codes and options,please stop going off topic..

I asked a simple question and got 10 different answers so far, few of them related to the actual question..

Its seems to bee a 1993 Corvette or Camaro LT1 and ECM.

WHAT CAN I DO TO MAKE MORE POWER ONT THAT MOTOR WITHOUT STROKING IT... I dont want to turbo and I dont want to run an aftermarket ECM, I would like to chip it or reflash it.

[cobalt327]

No bad's at all.

A while ago, Bogie had taken on a project of adapting the heads to the Gen 1 block. I don't think it ever came to fruition, but there's no denying that in the right hands, the LT1 will haul serious a-- and doesn't even need a ton of aftermarket parts to do it.

There was a high school class 'project' '96(?) Camaro w/an LT1 in it that was written up in one of the car rags- might have been CC or HR.

Anyway, w/a stock ECM, injectors and w/an adjustable regulator, stick shift w/4.11's, slicks and camshaft along w/head work, they got it to the 10's w/o much drama at all. The clutch went out, but that was about it. Full interior, etc. Basically still a DD if wanted.

The thing is, now that the LS engines are becoming more and more affordable, if I'm going to go "non-Gen I" it will be one of them I go with.