ys . ▁Many ▁were ▁over bor ed ▁from ▁the ▁original ▁ ▁to ▁ ▁using ▁T ome i ▁for ged ▁p ist ons ▁for ▁a ▁disp lacement ▁of ▁, ▁while ▁others ▁used ▁ ▁D ats un ▁Compet ition ▁for ged ▁p ist ons , ▁for ▁a ▁disp lacement ▁of ▁. ▁These ▁legend ary ▁engines ▁competed ▁in ▁Japan ' s ▁Tour ing ▁Sed an ▁( TS ) ▁class ▁races ▁against ▁the ▁ 1 2 0 0 s ▁arch rival ▁Toy ota ▁Star let . ▁ ▁Perhaps ▁the ▁most ▁interesting ▁variety ▁of ▁A ▁series ▁engines ▁was ▁the ▁A Y 1 2 ▁engine . ▁This ▁was ▁a ▁special ▁race - only ▁N iss an ▁factory ▁( works ) ▁racing ▁version ▁with ▁a ▁cross flow ▁cyl inder ▁head . ▁ ▁The ▁A Y 1 2 ▁was ▁used ▁in ▁an ▁under ▁- class ▁with ▁a ▁ ▁bore ▁diameter . ▁The ▁int ake ▁val ve ▁was ▁ ▁and ▁exhaust ▁val ves ▁were ▁. ▁The ▁p ist ons ▁were ▁also ▁a ▁special ▁design ▁and ▁the ▁val ve ▁ro cker ▁system ▁was ▁different ▁from ▁the ▁standard ▁A 1 2 ▁due ▁to ▁the ▁use ▁of ▁a ▁cross flow ▁layout ▁for ▁the ▁racing ▁engine . ▁ ▁App lications ▁▁ 1 9 7 0 – 1 9 7 3 ▁N iss an ▁Sun ny ▁B 1 1 0 , ▁and ▁B 1 2 0 ▁( N iss an ▁Sun ny ▁T ruck ) ▁▁ 1 9 7 1 – 1 9 7 3 ▁N iss an ▁Cher ry ▁E 1 0 ▁( D ats un