S1 L67 cylinder heads - 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 06-12-2007, 01:51 PM   #1
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Default S1 L67 cylinder heads

93 S1 L67 heads, will another model year work (94/95)? I am assuming that there is a difference between the L67 heads and the NA version? Can someone verify please?
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Old 06-12-2007, 02:11 PM   #2
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Actually .. IIRC the heads were the same for SC and NA from 93-95.
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Old 06-12-2007, 02:20 PM   #3
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93-95 L67 heads are the same as 93-94 L27 heads.

92 is the odd duck.
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Old 06-12-2007, 02:25 PM   #4
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I checked partsamerica.com and they list the same part # for both. I wanted to be sure before I go get a set of boneyard cheapies to play with.

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Old 06-12-2007, 03:26 PM   #5
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They ARE compatible, but only if you also swap the rocker pedestals, rocker arms, and rocker arm bolts.

Ideally, you want a set of heads from 94/95 for potentially fewer miles and roller pivot rockers. Or 93 and newer L27, or 94 and newer L67.
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Old 06-12-2007, 03:31 PM   #6
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Quote:
Originally Posted by willwren
93-95 L67 heads are the same as 93-94 L27 heads.

92 is the odd duck.
We prefer Underdog.. 92
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Old 06-12-2007, 03:32 PM   #7
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I'm planning on finding a set, porting, adding roller rockers and springs. If I understand correctly 94 (up to 99 or 95)? or newer L67 or 93 (up to 99 or 95?) L27? I guess a better question is what model year is the cutoff. Sorry, I'm confused ........ muscle relaxers due to the fact that I lost a wrestling match with the rear seat in the Bonne.

Mike .... i thought you would have said Mighty Duck!
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Old 06-12-2007, 03:57 PM   #8
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Quote:
Originally Posted by griff1455
I'm planning on finding a set, porting, adding roller rockers and springs. If I understand correctly 94 (up to 99 or 95)? or newer L67 or 93 (up to 99 or 95?) L27? I guess a better question is what model year is the cutoff. Sorry, I'm confused ........ muscle relaxers due to the fact that I lost a wrestling match with the rear seat in the Bonne.

Mike .... i thought you would have said Mighty Duck!
They are in the same grouping to me, but we still fight and use parts from other cars/engines to make some HP, or hope to.
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Old 06-12-2007, 04:03 PM   #9
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Quote:
Originally Posted by griff1455
I'm planning on finding a set, porting, adding roller rockers and springs. If I understand correctly 94 (up to 99 or 95)? or newer L67 or 93 (up to 99 or 95?) L27? I guess a better question is what model year is the cutoff. Sorry, I'm confused ........ muscle relaxers due to the fact that I lost a wrestling match with the rear seat in the Bonne.

Mike .... i thought you would have said Mighty Duck!
You can use L27 93-95( NA Tuned Port Injection 3800 ) or 94-95 L67 SC Heads... They will be the same heads

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Old 06-12-2007, 04:33 PM   #10
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Quote:
Originally Posted by griff1455
I'm planning on finding a set, porting, adding roller rockers and springs. If I understand correctly 94 (up to 99 or 95)? or newer L67 or 93 (up to 99 or 95?) L27? I guess a better question is what model year is the cutoff. Sorry, I'm confused ........ muscle relaxers due to the fact that I lost a wrestling match with the rear seat in the Bonne.

Mike .... i thought you would have said Mighty Duck!
I have a set of 93 heads off my parts car. Make me an offer plus shipping. I'll let them go fairly cheap as they are taking up space at my parents and I already have a spare 93 L67 short block and 94 L67 complete motor.
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