LT-4 into a LT-1 car
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,204
Likes: 4
From: Midland Georgia
St. Jude Donor '06
LT-4 into a LT-1 car
As some may know, I damaged my engine back in April. I was going to rebuild but now I have the opportunity to obtain a LT4 engine. I have a friend who is a local racer who can obtain the engine from GM at a very attractive price.
My car now is a 94 LT-1 car with a MN6. So here is the big question:
I know the engine will fit physically but what about the computer OBD system etc... Can I use this motor without having to reinvent the wheel so to speak?? I believe the LT4 car is OBDII and has a couple of extra 02 sensors...
My car now is a 94 LT-1 car with a MN6. So here is the big question:
I know the engine will fit physically but what about the computer OBD system etc... Can I use this motor without having to reinvent the wheel so to speak?? I believe the LT4 car is OBDII and has a couple of extra 02 sensors...
Drifting
Joined: Oct 2000
Posts: 1,257
Likes: 6
From: San Jose, CA, USA
LT4 motor will run from a OBD-1 harness and sensor set-up pefectly fine. You may want to retune it a little to take advantage of the increased airflow and power. But no issues plopping that LT4 on there and running it off the OBD-1 ECM and existing sensor connections. I think the only thing added with ODB-II was a second O2 sensor, which is not part of the engine itself anyway. The engine sensors are all the same.
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
The OBDII system added a few extra sensors and toubleshooting codes/diagnostics. You can certainly run an LT4 motor on an OBDI computer though...lots of people have done it. Other than the rear O2 sensors, the OBDII system also has a crank sensor to help determine misfire conditions as well.
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by Zix
The OBDII system added a few extra sensors and toubleshooting codes/diagnostics. You can certainly run an LT4 motor on an OBDI computer though...lots of people have done it. Other than the rear O2 sensors, the OBDII system also has a crank sensor to help determine misfire conditions as well.
You can just eliminate the crank sensor and it's pretty much a plug and play from there. If you remove the crank sensor completely, a 3/4" core plug will fill the hole. 
Le Mans Master
Joined: Feb 1999
Posts: 9,946
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Originally Posted by jakers
As some may know, I damaged my engine back in April. I was going to rebuild but now I have the opportunity to obtain a LT4 engine. I have a friend who is a local racer who can obtain the engine from GM at a very attractive price.
My car now is a 94 LT-1 car with a MN6. So here is the big question:
I know the engine will fit physically but what about the computer OBD system etc... Can I use this motor without having to reinvent the wheel so to speak?? I believe the LT4 car is OBDII and has a couple of extra 02 sensors...
My car now is a 94 LT-1 car with a MN6. So here is the big question:
I know the engine will fit physically but what about the computer OBD system etc... Can I use this motor without having to reinvent the wheel so to speak?? I believe the LT4 car is OBDII and has a couple of extra 02 sensors...
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by steve40th
What dealer is still keeping one hidden from Stock. I havent been able to find an LT4 engine in quite sometime.
Le Mans Master
Joined: Feb 1999
Posts: 9,946
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Originally Posted by Corvette Kid NC
You don't think he's gonna tell you, do you?
And I emailed Chris May a while back, and it was unavailable.
But your right, if he has one, why would he tell us.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,204
Likes: 4
From: Midland Georgia
St. Jude Donor '06
Shhhhh!!!!
Originally Posted by steve40th
What dealer is still keeping one hidden from Stock. I havent been able to find an LT4 engine in quite sometime.
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Le Mans Master
Joined: Feb 1999
Posts: 9,946
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Originally Posted by jakers
I am not telling until mine rolls into the shop... It is a long block not a production engine. This is what I have been told by my buddy who is buying it. I will wait and see what is unloaded from the truck. Now I just need a LT-4 intake manifold. That is funny part, dont you think??
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by steve40th
Better get on E Bay and get your LT4 intake, as they are going for stupid prices now. Or wait till Edlebrock actually makes theres. Or, for 500 bucks, EPORTworks (LLoyd Elliot) will port/weld etcetc to make the LT1 work on the LT4 heads.
I'll bet if you've got any good local performance fabricators you could have an LT1 intake modified to work for much less than five bills.
Le Mans Master
Joined: Feb 1999
Posts: 9,946
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Originally Posted by Corvette Kid NC
It's insane what they're going for. Had I known, I'd have bought out Summit when they had them new for $200 and maybe I could retire! I'll bet if you've got any good local performance fabricators you could have an LT1 intake modified to work for much less than five bills.
I'll bet if you've got any good local performance fabricators you could have an LT1 intake modified to work for much less than five bills.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,204
Likes: 4
From: Midland Georgia
St. Jude Donor '06
Perhaps
Originally Posted by Vis Croceus
You'd end up with a much better engine for less money by rebuilding.
Update: located a LT4 intake for $600.00. On my way to buy it tomorrow.
