GSR head is going to raise your compression a little bit & not flow air as well, thats why you use your nice built bottom end with low compression pistons & give the head a port & polish job so that it flows as good or better than the b16 head. This will allow you to run more boost & have a much more reliable ls/vtec setup.

the b16 head will flow air a little better but is limited to the amount of performance that it can give u vs. the gsr head.

There is a lot of information out there for this conversion & a lot of different "opinions" because there is not way that it set in stone for how to do this. the thing is, the ls/vtec puts down great numbers & gets a bad reputation because people dont't take their time & build the motor properly, the bottom end MUST be built to handle this thing in the long run. & if you want to see great numbers from a ls/vtec, BUILD the block & make sure that you have the thing tuned professionaly. You MUST have good fuel managment & timing with an ls/vtec motor or say good bye to your motor.

RESEARCH is key good luck to all who build their ls/vtec's