Ok, I was just wondering if the porting is the same for both the b20 and the b18 cause I have a b20 head I can put on my b18a to lower comp. to run more boost. Would this work? I was thinking I was gonna run 9lbs on the b18 but now I might run 11-12 with the b20 head if it lowers comp. Thanks.

 

anyone???

 

in theory it will work I was thinking the same thing just make sure you get the right head gasket

 

The b20 head is EXACTLY the same as the b18. Even the dome and head gasket is 81mm just like the b18 head.

 

Yes. no difference. I believe the casting numbers on the head are even the same.

 

I thought the b20 was 84mm? am I wrong?

 

Same exact head.. Yes, wrong..

 

i thougth the same thing.

 

so you mean the head is not 84mm??? Because the block is 84mm. I know that for a fact!