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I asked a couple of my older engine builder friends and nobody knew. The one comment I will make about your analysis is that the cores can’t be E or S. 4 bearing cams didn’t come out until the 3l engines.
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1974 914 Bumble Bee
2009 Outback XT
2008 Cayman S shop test Mule
1996 WRX V-limited 450/1000
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