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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 08-31-2009, 09:47 PM   #1
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Default engine swap possible?

Hey guys.
bear with me here, i've asked this question before but its been so long since i've done this.

Will a 91 Lesabre 3800 fit in my 93 Park avenue 3800? I know the intake manifold would have to be changed, but is there any differences between these engines that would keep me from swapping em?

I suspect my park avenue'* engine has weak compression. it has a wierd miss at idle that smoothes out with at higher rpms. This is because i roasted the motor till i heard metal clanking and since then, it hasn't been right. The miss disappeared for a few months, but now its back, and the engine feels weak, its worse towing a trailer.

The 91 has a low miles engine, and its quiet as can be. I figured to swap the engines, and i would have something like new on my PA.

Another thing i wanted to do. My PA'* engine had 385,000 kms on it. Is it worth it to do a rebuild? I was also thinking of boring it out, new pistons, rings, and doing the complete motor. I was thinking of a few mild upgrades to the motor to tune it a bit. Is there any benefit to this? Will gas mileage be worse after boring it out? I know I could swap in a series 2 motor, but i want a fuel miser and to be able to run reg gas.

Thanks, i'd appreciate any input.
2009 Pontiac Vibe AWD 2.4
1993 Buick Park Avenue 3800
1984 Chevrolet Citation 2.5 liter four.
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Old 09-01-2009, 09:03 AM   #2

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Isn't the 91 the C motor and the 93 is an L27? I'm unsure of the differences in head or otherwise beyond them simply being different from teh exterior.
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