ars ▁but ▁when ▁Ferr ari ▁sold ▁them ▁to ▁customers ▁they ▁removed ▁the ▁Lucas ▁Mechan ical ▁F uel ▁In jection ▁and ▁replaced ▁it ▁with ▁We ber ▁car b ure t ors ▁which ▁reduced ▁their ▁output , ▁something ▁Ferr ari ▁wanted ▁to ▁do ▁so ▁that ▁they ▁would ▁win ▁points ▁but ▁not ▁beat ▁the ▁factory ▁cars ▁which ▁were ▁then ▁P 4 ▁ 0 8 4 6 ▁( See ▁A bove ), ▁P 4 ▁ 0 8 5 6 , ▁P 4 ▁ 0 8 5 8 , ▁and ▁P 4 ▁ 0 8 6 0 . ▁ ▁The ▁P 3 ' s ▁and ▁ 4 1 2 ▁P ▁had ▁the ▁same ▁ 4 - liter ▁block ▁which ▁is ▁different ▁from ▁the ▁P 4 - 4 ▁liter ▁block ▁and ▁all ▁had ▁P 3 ▁not ▁P 4 ▁ch ass is . ▁All ▁of ▁the ▁P 3 ▁ch ass is ▁were ▁made ▁in ▁ 1 9 6 6 ▁at ▁the ▁same ▁time ▁but ▁because ▁of ▁labor ▁strik es ▁only ▁three ▁of ▁the ▁five ▁P 3 ▁ch ass is ▁were ▁built ▁up ▁into ▁cars ▁in ▁ 6 6 . ▁ ▁The ▁un built ▁up ▁P 3 ▁ch ass is ▁were ▁eventually ▁build ▁up ▁into ▁ 4 1 2 P ▁ 0 8 5 0 ▁and ▁ 0 8 5 4 ▁in ▁ 1 9 6 7 . ▁P 4 ▁ 0 8 4 6 ▁was ▁unique ▁having , ▁after ▁modification ▁by ▁Ferr ari ▁for ▁the ▁ 1 9 6 7 ▁race ▁season , ▁a ▁P 3 ▁ch ass is ▁with