Is there any significant differences between the head on a 91 B18 and B20? Will the B20 head bolt onto a 91 block?

 

i believe they're essentially the same head. i think the real difference lies in the block.

however, i don't know much about the b20.. but i'm pretty sure about that.

 

yes there is a big difference. The obd0 b18a engines (1990-1991) don't have the better characteristics of a 1992+ b18b head or b20 head. Get a 92+ or b20 head, not the 90-91.

 

Thanks. The reason I am asking is, I have a B20 laying in the back of the shop and I am buying a wrecked 91 with a "just installed" JDM engine. I am going to be putting some combination of these two engines into my 89 Integra "beater" so I have a car to drive.