Swapping 3800 S2 for S1 - 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 02-07-2009, 10:05 PM   #1
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Default Swapping 3800 S2 for S1

Hey guys, this isn't for a bonneville, but it seems you have more knowledge about the L27'* than others. I picked up a '95 Buick Regal with the L27, most likely the engine is bad (haven't picked the car up yet) and i've got a couple L36'* laying around in the garage. Is it possible to swap just the SII longblock and use the SI intake/exhaust manifolds? Or would the whole motor have to be swapped in?

If I do have to swap the whole motor, will it take a lot of wiring to get it running right? Not looking to go supercharged with this car (got a '97 GTP for that), just want to get it running right and save some $$$ since i've already got the motors.

Thanks in advance.
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Old 02-09-2009, 07:47 AM   #2
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I don't have an answer for you but this website might:

http://gmtuners.com/

contact them. They may know.
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Old 02-09-2009, 08:01 AM   #3
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The L27'* have one cylinder offset from the other two, the S2 has all three symmetrically spaced. This keeps the parts from being swapped w/o doing some serious fabrication.

EGR was located on the front of the motor S1 and back of the motor for S2'*. The wiring part is possible if you use just one knock sensor vs the two and make some changes.
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Old 02-09-2009, 03:31 PM   #4
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Sweet, thanks for the info guys. If necessary, i'll just see if I can pick up an L27 from a yard for $400. Would like to have the series 2 with ~40 more HP, though.

EDIT: Oh yeah, I don't run EGR on my cars, gunks up the intake too much. Especially on the GTP, because it'* intercooled.

Last edited by 99GT2dr; 02-09-2009 at 03:37 PM. Reason: added info
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