Hi, Firts i from venezuela, sorry for my english in my country speak spanish. ok i wanna make a swap in a civic si 1993 or in a civic 1993 hb but i dont know what block its best. im my country i only can find 3 types of blocks from b series. thats are: b16a1 vtec SiR b18b acura ls 96 - 98 b20b CRV 99 - 01 a friend has a civic si 1993 with a b20b with b16 head vtec, he said his that his car have 200hp cus he kill the new civic si with a k20 in 1/4 mille. i think he has only like 160hp.. and hes trassmision are good (4.40 relation). ok now what block ur recommend to me to get the more horsepower just aspirate? but in a future ill wanna instal a turbo kit. what block its best with turbo and what block its best aspirate and what block works for both good. friends recommended to me the b20b with a head b16 vtec thats the best i can do? that b20b with a b16 vtec head its the best what i can do? please help what i can do? who be my best selection? thanks and sorry for my english.