L36 vs. L67 - 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 11-21-2002, 11:00 AM   #1
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Default L36 vs. L67

Is there a main difference between the L36 and the L67 engine, besides the supercharger?
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Old 11-21-2002, 11:03 AM   #2
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Compression ratio is different, the L67 uses forged pistons and crank, the cam gear is different, the heads are different, the lower intake is different......about the only things that are the same as in IDENTICAL, are the TB, the valve covers, and the block itself....maybe the exhaust manifolds also, but I'm not positive on this. Jr or Hector would know, and I might have missed a couple things. Where your REALLY get into some differences is between the L27 and L36, also. They're not as closely related as they may appear, either.
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Old 11-21-2002, 05:13 PM   #3
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If the same supercharger from the L67 is put on the L36, will there be some conflicts then?
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Old 11-21-2002, 05:24 PM   #4
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Yes there will be conflicts. The injectors are also in different places on the L67 and L36. That'* why the L67 has then in the heads and the L36 has it in the manifold. The exhaust manifolds are the same for all Series II engines so when you put headers on an L67 that'* why they gain 20HP to the wheels easy. The Series I (L27) and Series II (L36) N/A engines are really different. A swap between the two would require quite a few items. Including the Series II exhaust manifolds since both engines have different heads.
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Old 11-21-2002, 06:39 PM   #5
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I posted an article on this subject up in Techinfo.
Here'* the link:
http://www.bonnevilleclub.com/techinfo/?article=43
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