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Old 06-19-2006, 10:02 AM   #31
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Mac..those rockers are a different ratio. That'* the reason for the swap.
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Old 06-19-2006, 12:27 PM   #32
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Let me explain this a little better....

The 88-91 Vin C 3800 had Roller lifters and the Rockers used a Pivot( There was friction here at this pivot )

In 1993 the Tuned Port 3800 went to a roller pivot which reduced valvetrain friction... I would love to have the L27 heads on both of my 91'* for just that reason...

The L36 and 96+ L67 used the newer style Roller... But none of these used the roller tip...

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Old 06-19-2006, 02:22 PM   #33
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Quote:
Mac, the roller rockers started in 1993.
My L67 DOESN'T have those...all solid stuff...but I DID see the roller-pivots in an L27 head at the boneyard. Would an L67 Series 1 benefit from the roller-pivot swap?
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Old 06-19-2006, 03:02 PM   #34
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Sandrock, my 93 SSEi is roller pivot. From the factory.
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Old 06-19-2006, 03:48 PM   #35
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Quote:
Originally Posted by willwren
Sandrock, my 93 SSEi is roller pivot. From the factory.
Yes all 93'* should be roller pivots from the factory

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Old 06-19-2006, 04:08 PM   #36
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sandrock

You think maybe he has 92 heads?
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Old 06-19-2006, 04:38 PM   #37
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Quote:
Originally Posted by OLDsman105
sandrock

You think maybe he has 92 heads?
either that or a 92 engine....

Sandrock what was the production date of the car?

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Old 06-19-2006, 05:18 PM   #38
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Uh-oh...hope this isn't considered hijacking

Don: Build date is 2-93 I think. I know for fact it isn't a late 92. Also, the original rod bearings showed a 93 stamp date. So, at the VERY least, the short block is original.

Wilren and Oldsman: Solid pivots as shown in the pics provided. These pics are big to show all the codes on the head that I have pulled so far. Considering all the junk that was in this head, I think they came out very well for being a home jobber (I just ground down some high spots in the exhaust ports, didn't touch the intake ports at all, and cleaned up the water ports).





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Old 06-20-2006, 01:26 AM   #39
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Quote:
Originally Posted by jr's3800
The L36 and 96+ L67 used the newer style Roller... But none of these used the roller tip...
When I was thinking of roller rockers, I was thinking of roller tips. I never knew about roller pivots until now.
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Old 06-20-2006, 12:15 PM   #40
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Quote:
Originally Posted by MACDRIVE
Quote:
Originally Posted by jr's3800
The L36 and 96+ L67 used the newer style Roller... But none of these used the roller tip...
When I was thinking of roller rockers, I was thinking of roller tips. I never knew about roller pivots until now.
Took us a lot of learning too....lol

Sandrock, I am very interested here.... Can you by chance rear the part number on the head/* ?

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