L67 HB on an L36? - 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 11-13-2007, 01:07 PM   #1
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Default L67 HB on an L36?

Let'* say you put a harmonic balancer from a '98 L67 on a '98 L36...would it work?
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Old 11-13-2007, 01:23 PM   #2
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It'* definitely been done before, on other years at least.
(I've seen a bunch of full L67 top swaps)
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Old 11-13-2007, 01:34 PM   #3
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Quote:
Originally Posted by 95naSTA
It'* definitely been done before, on other years at least.
(I've seen a bunch of full L67 top swaps)
I guess what I'm asking is, would it work without the rest of the top swap being on there...

That is, suppose you did a full top swap, then--for some odd reason--had to swap your L36 UIM / LIM back in temporarily (and of course remove the */c belt)...would it run right?

(Maybe it'* time to move this to Performance forum?)
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Old 11-13-2007, 01:37 PM   #4
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Yes it should as it'* balanced and only has the second level of ribbing for the second belt. That shouldn't affect performance.
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Old 11-13-2007, 01:37 PM   #5
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As long as the timing rings are the same, it will work.
The inner belt path is the same as the L36
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Old 11-13-2007, 09:36 PM   #6
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Default Re: L67 HB on an L36?

Quote:
Originally Posted by agrazela
Let'* say you put a harmonic balancer from a '98 L67 on a '98 L36...would it work?
No. (Ok, I'll re-phrase that as "maybe")

It will fit, but it will not balance the rotating assembly. L67 rods and pistons weight quiet a bit more than L36 bits and the balancers on both motors are not neutral balance. When I did mine, the shop that did the rotating assembly for me, pointed out the difference in balancers. L67 balancer on L36 crank with L67 Rods, Pistons, and flexplate balanced. L67 on L36 with L36 rods & pistons would not balance out.

How bad, I dunno, I didn't assemble the engine with that combination.
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Old 11-14-2007, 01:14 AM   #7
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Default Re: L67 HB on an L36?

Quote:
Originally Posted by clm2112
Quote:
Originally Posted by agrazela
Let'* say you put a harmonic balancer from a '98 L67 on a '98 L36...would it work?
No. (Ok, I'll re-phrase that as "maybe")

It will fit, but it will not balance the rotating assembly. L67 rods and pistons weight quiet a bit more than L36 bits and the balancers on both motors are not neutral balance. When I did mine, the shop that did the rotating assembly for me, pointed out the difference in balancers. L67 balancer on L36 crank with L67 Rods, Pistons, and flexplate balanced. L67 on L36 with L36 rods & pistons would not balance out.

How bad, I dunno, I didn't assemble the engine with that combination.
So I wonder if all these dudes over on ClubGP running around with top swaps are shaking their motors apart...must inquire over there...
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Old 11-14-2007, 01:31 AM   #8
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L36 and L67 balancers are almost identical. The L36 balancer is still really wide, it just doesn't have the ribs in it for the extra belt.

I've had a L67 balancer on my car for 20k miles now. And thats on a bottom end that had 212,000 miles on it when I put the balancer on there...
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Old 11-14-2007, 03:40 AM   #9
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I dunno...I've been researching this some more and I'm getting mixed messages.

Some say it works fine; others say that L36 and L67 HB'* are NOT balanced the same and thus are NOT interchangeable...not to mention that L36 and L67 app'* apparently also have differently-balanced flywheels (flexplates).

I'm at the point where I'm thinking that a classic top-swap is too much risk for me to take, because of questions over these HB and flywheel balance issues. I can't be shaking my engine or tranny apart, or doing other mechanical things that can't be addressed through tuning.

Now, some kind of bastardization of the zzp SS M90 kit, maybe...
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Old 11-14-2007, 09:09 PM   #10
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Default Re: L67 HB on an L36?

Quote:
Originally Posted by agrazela
So I wonder if all these dudes over on ClubGP running around with top swaps are shaking their motors apart...must inquire over there...
With so many people getting away with it, it can't be that bad I guess. Perhaps the machinist doing mine was just being anal-retentive (works for me ) Or perhaps I just had parts from opposite ends of the tolerance limits.

The whole subject came up because he couldn't find any published specs on how to properly balance a Series II. He worked off what GM did on the original assembly.
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