L27 to L67 Conversion - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-15-2005, 03:08 PM   #1
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Default L27 to L67 Conversion

OK, I know it'* not a Pontiac but please don't throw me out! I have a 93 LeSabre 3800 (L27 I think) with a 167K miles and a dying automatic. I have been offered a 94 L67 from an SSEi with a 101K and a rebuilt tranny. Question is if I convert what am I going to run into? The LeSabre didn't get the L67 so is my wiring harness go to be correct? Any infromation would be greatly appreaciated.

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Old 10-15-2005, 03:23 PM   #2
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Hey, neighbor. You're going to need to modify or swap the wiring harness, and you need a PCM from the donor car or another 94/95 SSEi.

www.L67swap.com may be of further assistance. And you're more than welcome to hang out here. We welcome all GM 3800'* and H/W/C/G bodies. LeSabre'* don't have a dedicated home other than here.
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Old 10-15-2005, 03:36 PM   #3
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If your not out for power and don't car to run premium fuel. Take the L67 and swap your L27 lower intake, upper intake, fuel rail, injectors, and TB. then get a PCM made by GMTumers for the different gearing in the trans.
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Old 10-15-2005, 03:53 PM   #4
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Quote:
Originally Posted by llBlazin_llLo
If your not out for power and don't car to run premium fuel. Take the L67 and swap your L27 lower intake, upper intake, fuel rail, injectors, and TB. then get a PCM made by GMTumers for the different gearing in the trans.
Engine brackets, exhaust manifolds, EGR, and harmonic balancer would also have to change. In addition to at least one trans mount.
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Old 10-16-2005, 12:01 AM   #5
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Thank for the information - We figured we would need the harness and salvaged it, not sure if the PCM was saved ( I wasn't there to supervise). One thing I forgot to mention and probably should have, was that the L67, trany, everything was rolled out on the front carrage. Will that entire unit bolt back into my LeSabre? Thanks again for all your help.
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Old 10-16-2005, 12:07 AM   #6
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I'm about 98% sure it will. You're dealing with an H body as well so the dimensions should be the same. I bolted a 97 subframe into a 90 Bonneville but was certain it would fit cause I had the dimensions from the service manuals.
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