What years Series II cylinder heads are compatible - 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 03-19-2006, 12:15 PM   #1
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Default What years Series II cylinder heads are compatible

I need to either get my current heads reconditioned, or find some low-mile used heads. What years Series II heads interchange? This is for my 1997 SE. Thanks.
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Old 03-19-2006, 12:20 PM   #2
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I won't pretend to be the expert, but I think 98 or newer for you would be safe. Wait for a second educated opinion.

What'* wrong with your heads? We RARELY have issues with them.
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Old 03-19-2006, 12:40 PM   #3
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Quote:
Originally Posted by willwren
What'* wrong with your heads? We RARELY have issues with them.
Well, that'* just the thing. Maybe nothing is wrong with them. If you read the second page of my thread "crank/no start", you'll see that I had bad compression on both banks. I suspect that it was the head gaskets, but I don't know that the heads are good. I do know that the cylinders that were getting coolant in them have valves that don't look so good. I'm just exploring options. It would be cheaper to find some low-mile heads from a newer engine than have mine rebuilt.
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Old 03-19-2006, 04:31 PM   #4
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I've read somewhere that the earlier series 2 heads are more prone to cracking around the valve but I'm not sure how true that is.
Make sure your not getting any coolant in your oil because that will eat away at your bottom end.
Have you checked to see if it'* your upper intake manifold?(Common problem)
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Old 03-19-2006, 07:58 PM   #5
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Quote:
Originally Posted by 95naSTA
I've read somewhere that the earlier series 2 heads are more prone to cracking around the valve but I'm not sure how true that is.
Make sure your not getting any coolant in your oil because that will eat away at your bottom end.
Have you checked to see if it'* your upper intake manifold?(Common problem)
Oh, it was getting coolant in the oil alright. I just don't know for how long. If you're bored, read my "crank/no start" thread down this page a little. I already have the heads off. I can't say for sure that it'* the head(*), the head gaskets, or other. I just know that I had erratic compression, and there is definitely a problem down there. I can't just throw my old heads back on and hope it was the head gaskets.
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Old 03-20-2006, 02:31 AM   #6
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Quote:
Originally Posted by willwren
What'* wrong with your heads? We RARELY have issues with them.
My original set had a tick. Unsure of my second set as the valves were all white (my front exhaust manifold caught fire somehow). My third set has the tick as well. I assume it is a problem with the valves, but I suppose that it could be lifters. I just have bad luck with engines I guess.
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