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I believe that the crank, rods, and pistons are all forged in the 951. I have heard rumours that the later 951 pistons were cast and not forged, but I have never been able to confirm that.
Different head as well, the 951 uses sodium-filled valves for better heat transfer. Cam was also different.
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Silver 1998 Volvo S70 T5 <- Daily (Anja)
Guards Red 1986 951 <- Seattle car (Gretchen)
White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei)
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