rod s ▁from ▁the ▁port ing ▁allowing ▁ 8 ▁individual ▁ports ▁instead ▁of ▁ 5 ▁originally , ▁and ▁moving ▁the ▁oil ▁p ump ▁from ▁the ▁rear ▁of ▁the ▁cam sh aft ▁to ▁the ▁right ▁side ▁of ▁the ▁block . ▁As ▁production ▁continued , ▁ 1 9 7 4 ▁and ▁newer ▁A - series ▁engines ▁had ▁different ▁block ▁cast ings , ▁with ▁re located ▁motor ▁mount ▁b oss es . ▁ ▁__ TO C __ ▁ ▁A 1 0 : ▁the ▁first ▁A - series ▁engine ▁The ▁A 1 0 ▁is ▁a ▁ 1 . 0 - liter ▁( 9 8 8   cc ) ▁engine , ▁released ▁in ▁September ▁ 1 9 6 6 ▁in ▁the ▁ 1 9 6 7 ▁model ▁year ▁D ats un ▁ 1 0 0 0 . ▁The ▁A 1 0 ▁featured ▁a ▁three ▁main ▁bearing ▁c rank sh aft . ▁B ore ▁was ▁ 7 3   mm ▁and ▁stroke ▁was ▁ 5 9   mm ▁( same ▁as ▁the ▁N iss an ▁C ▁engine ). ▁With ▁a ▁two - bar rel ▁Hit achi ▁car b ure tor ▁and ▁an ▁ 8 . 5 ▁to ▁ 1 ▁compression ▁ratio ▁this ▁engine ▁produced ▁ ▁at ▁ 6 0 0 0   r pm ▁and ▁. ▁The ▁D ats un ▁ 1 0 0 0 ▁C oup é , ▁introduced ▁in ▁Sept ▁ 1 9 6 8 , ▁was ▁equ ipped ▁with ▁an ▁u pr ated ▁A 1 0 ▁engine ▁bo ast ing ▁a ▁free ▁flow ing ▁dual ▁out