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 Post subject: Mods For Series I L27
PostPosted: Sat Jul 04, 2020 10:13 pm 
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Joined: Sat Jul 04, 2020 10:09 pm
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Year and Trim: 1992 Buick Lesabre
Just recently bought a 92 Buick Lesbare not knowing that there is not much of a modding scene for the Series I. I would still like to do some mods would like to stay NA. I have a budget of around 500. Trying to get another 20-30 hp out of it. Was thinking of doing a cam but cannot find one anywhere for the series 1 do the series 2 cams fit in series 1? Any input is appreciated. I am not going to swap it for the series II because I don't have enough free time to do so and this is my daily.


Last edited by wesrb on Sun Jul 05, 2020 4:54 pm, edited 1 time in total.

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PostPosted: Sun Jul 05, 2020 10:38 am 
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Joined: Mon May 19, 2008 7:01 pm
Posts: 16861
Location: Central Illinois
Year and Trim: 1992 SSE
2009 G8 GT
Talk to Crow Cams. They are out of Australia, where the mod market for the Series 1 was stronger. They have a different name for the engine, so you have to explain carefully.

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PostPosted: Mon Jul 06, 2020 6:55 pm 
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Joined: Mon May 10, 2010 6:11 pm
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Location: Chicago, IL
Year and Trim: 2003 SLE
20-30 horsepower will be nearly impossible with that budget much less being NA.

Start with a different platform.

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PostPosted: Tue Jul 07, 2020 11:51 am 
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Joined: Wed May 21, 2008 11:47 pm
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Location: Philly
Year and Trim: 95 SLE
Depending on your ability and you-pull-it junkyard options, you could probably swap in a L36 and get a custom tune for $500. That would reliably push the car into the later half of the 90s at least. A Series 1 or 2 L67 wouldn't cost much more but the transmission wouldn't last. If you have to pay to have the work done, quadruple the price.

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PostPosted: Tue Jul 07, 2020 10:02 pm 
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Joined: Tue May 27, 2008 8:53 am
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Location: Las Cruces, NM
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
Unfortunately, the above posts are just about it.

Custom cold air intake and high flow cat will free it up a bit for pretty cheap. Porting and polishing will put a bit of pep in its step as well. There were some rockers that would fit series 1, but only the 94-95 heads if memory serves (bolt sizing different).

The bottom end can't take much more.

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PostPosted: Tue Jul 07, 2020 10:16 pm 
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Location: Dearborn, MI
Year and Trim: '93 SSEi
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I would find an entire series 1 L67 donor from a park avenue or bonneville and swap everything over - it's stock, it's reliable, and it's way more power than $500 will get you on the N/A setup. You might have to verify the pins on the connector under the dash for the engine/pcm harness match, but it's mostly a drop in swap (complete engine/trans/harness/ecm), and you might be able to find a donor in the $400 range. That's what I did with our '93 SE way back in the day. Was done in a busy weekend.

Other options are to find a junkyard turbo if you have a MIG welder, upgrade the pcm to the 98+ 3800 one to make tuning easier. Again, a lot of work on you to pull it off, but if you're thrifty it could be done in the $500 or so budget. 5psi would give you a nice boost in power, but the trans is probably not going to be happy.

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'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'84 Sierra Classic - Twin turbo 3800
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