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

Engine Swap Question?

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Old Dec 27, 2009 | 12:01 PM
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Default Engine Swap Question?
Will a 93 lt1 speed density engine work in a 94 formula with the original wiring harness. I do have a maf that is replacing the speed density
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Old Dec 28, 2009 | 11:14 AM
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You will need to use the 94 PCM, change the opti harness, and use the 94 throttle body or change the IAC connector. Other than that I dont see why it wont work. Tune MAY need some tweaking.
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Old Dec 28, 2009 | 11:16 AM
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You're going to need a 94-95 harness if I remember correctly. Perhaps someone else will chime in.
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Old Dec 28, 2009 | 11:40 AM
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The pcm and harness are still original to the car and im pretty should i can still get the wiring harness from the 93 motor. So i should have everything the change over for the iac and opti. Thanks for your help btw
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Old Dec 28, 2009 | 12:23 PM
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what is involved in switching harnesses over for the opti spark, or would it be easier to just buy a vented opti
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Old Dec 28, 2009 | 12:29 PM
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do you have a vented now ? I have a early 94 and it is the non vented
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Old Dec 28, 2009 | 12:41 PM
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I'm not sure I don't have the original engine. I'm working on finding out if it was vented or non vented
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Old Dec 28, 2009 | 11:20 PM
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So for sure the current harness in the car is for a vented opti
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Old Dec 29, 2009 | 10:28 AM
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Originally Posted by BlackBird87
Will a 93 lt1 speed density engine work in a 94 formula with the original wiring harness. I do have a maf that is replacing the speed density
Yes everything is the same including the opti on 93+94, the only thing you will have to change is the TB and the intake the fuel rails are different on a 93. Also 93 had 22lbs injectors and 94-97 had 24lbs injectors so dont get those mixed up.
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Old Dec 29, 2009 | 10:33 AM
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he has a late 94 so he has a vented opti, early 94's like mine did not
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Old Dec 29, 2009 | 10:50 AM
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Originally Posted by djjab57
he has a late 94 so he has a vented opti, early 94's like mine did not
Sorry, forgot about that!! I think the rest of the info is correct though.
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Old Jan 5, 2010 | 12:48 PM
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The 93 engine is complete so if i just change the 22lbs injectors for 24's that should work right? as for the tb can i just change the connector for the iac?
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