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I'm not current on the dates of production changes to the P11, but somewhere along the way, Nissan installed the roller rocker engine in the P11. So, this has different cams and rockers (and currently there are no cam offerings for this car in The States). That engine also has a revised crank and no lower engine girdle.
The engine girdle (officially called the Main Bearing Beam) removal cuts windage losses and probably accounts for all of the 5 hp increase.
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George Roffe
Houston, Texas USA
00 328i
91 SE-R (well modded)
84 944 SCCA ITS race car under construction
"I fear all we have done is to awaken a sleeping giant and filled him with a great resolve"
-- Admiral Yamamoto, December 7, 1941
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