series 2 L67 crank in series one L67 block? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-11-2008, 02:23 AM   #1
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Default series 2 L67 crank in series one L67 block?

series 2 L67 crank in series one L67 block? Can it be done with no mods
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Old 04-11-2008, 02:25 AM   #2
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I'm gonna jave to say NO, the blocks (other then displacment) are nothing alike
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Old 04-11-2008, 02:34 AM   #3
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what specs are different then?
are the journals a different size?

SteveX seems to think it will work
http://www.lesabret.com/phpBB/viewto...5542&start=165
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Old 04-11-2008, 09:03 AM   #4
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They are different part numbers. My gut tells me no. My common sense asks me 'why?'.
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Old 04-11-2008, 12:16 PM   #5
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The guy did say his S2 crank has been weight reduced, I guess that'* why he wants to reuse it.

Smart money says he'* headed for a heartbreak, but let'* keep an eye on this and maybe we'll all learn something.
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Old 04-11-2008, 12:54 PM   #6
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He won't be posting about it over here. He was removed from our membership last week.
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Old 04-11-2008, 02:33 PM   #7
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Quote:
Originally Posted by Dirtracr95
what specs are different then?
are the journals a different size?

my questions too... I wanted to know after I saw a lineup of several different years of 3800 crankshafts in Engine Builder March 2008. While a very poor way to judge, the photors appeared to have all of the journals lining up, though dimensions are still unknown since they aren't mentioned in the article.
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Old 04-11-2008, 02:42 PM   #8
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Quote:
Originally Posted by agrazela
The guy did say his S2 crank has been weight reduced, I guess that'* why he wants to reuse it.

Smart money says he'* headed for a heartbreak, but let'* keep an eye on this and maybe we'll all learn something.
i didnt see anywhere where he said that his series 2 crank had the weight reduced. I made the comment about weighing the stock series 1 and weighing the stock series 2 to see how much lighter it is. Since that seems to be everyones explanation for why the series 2 engines have a higher redline.
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Old 04-11-2008, 02:48 PM   #9
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The counterweights on the S2 crank are closer to the center, and smaller. That could possibly attribute to the higher redline. Less power wasted on centrifugal energy. Less stress on the material.
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Old 04-11-2008, 04:27 PM   #10
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Quote:
Originally Posted by Dirtracr95
i didnt see anywhere where he said that his series 2 crank had the weight reduced.
He said that it was knife edged. That removes a significant amount of weight from the counter weights. Hopefully the assembly will be balanced agian.
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