Replacing 1990 L98 with 1987 L98.
Thread Starter
Instructor
Joined: Jul 2008
Posts: 218
Likes: 0
From: Utah County Utah
Replacing 1990 L98 with 1987 L98.
I am putting an 87 L98 in my 1990 vette to run for a couple of years while I nail down and start building up a 400ci.
The 87 has a MAF while the 1990 utlizes speed density. Can anyone tell me what I will need to swap out from my original engine? The idea is to basically just drop this engine in. I don't want to take it apart - that means you need to start buying seals, gaskets and more.
Does it basically just come down to the intake plenum? Are there any sensors that I need to add or swap?
*Edit - and just so we are clear, the 87 engine is a long block - it's extra long even. It has all brackets, alternator, power steerting, AC, all the smog related pumps, hoses and tubes. I have the wiring harness and ecm too.
The 87 has a MAF while the 1990 utlizes speed density. Can anyone tell me what I will need to swap out from my original engine? The idea is to basically just drop this engine in. I don't want to take it apart - that means you need to start buying seals, gaskets and more.
Does it basically just come down to the intake plenum? Are there any sensors that I need to add or swap?
*Edit - and just so we are clear, the 87 engine is a long block - it's extra long even. It has all brackets, alternator, power steerting, AC, all the smog related pumps, hoses and tubes. I have the wiring harness and ecm too.
Last edited by jdraughn; Mar 21, 2009 at 04:39 AM.
Thread Starter
Instructor
Joined: Jul 2008
Posts: 218
Likes: 0
From: Utah County Utah
On this page: http://www.fuelinjection.com/portinj.html
It appears to mention some of this stuff.
Looks like I will need to use the distributor from my 1990 and swap the knock sensors for one - back to looking for more info.
Actually, I reread the text "The EST module, in the distributor and knock sensors are different than the earlier models and must be matched. All hardware components are interchangeable with earlier models."
* So I just need to swap out the EST module or the whole distributor - plus the knock sensors.
* Plug the ninth injector hole
* - still reading
It appears to mention some of this stuff.
Looks like I will need to use the distributor from my 1990 and swap the knock sensors for one - back to looking for more info.
Actually, I reread the text "The EST module, in the distributor and knock sensors are different than the earlier models and must be matched. All hardware components are interchangeable with earlier models."
* So I just need to swap out the EST module or the whole distributor - plus the knock sensors.
* Plug the ninth injector hole
* - still reading
Last edited by jdraughn; Mar 21, 2009 at 05:40 AM.
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
Thread Starter
Instructor
Joined: Jul 2008
Posts: 218
Likes: 0
From: Utah County Utah
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
Never hurts to do this. It sounds like you found a perfect short-term answer for you car while you build your motor...congrats
