i have done a search, and want to see if there is any new info?
i know swaping a Vtec head on a LS is stright forward becasue of the matching bore!
But with the extra few mm does aything have to be done to the head (machine work) to make it work properly?
thanks again
please list and the reasons for it

 

I doesn't have to be opened up..but you can

 

from what i figure, if it was important, lots more people would be promoting it as the thing to do?!?!

t..

 

I didn't do it this first time, but I'm considering it when i get a new head done

 

you don't have to. that just makes a 1.5mm lip ring at the top of the cylinder that provides minimal quench area, and having the chamber matched would lower the compression a little. if you were blowing lots of boost or nitrous, it could be a potential stress riser and detonation-promoting heat sink, but only under extreme situations.

 

That is a shorter version of what I would have said , but I do believe in opening up the combustion chamber no matter what set-up your running just solely for the added breathing capability of the extra clearance between the valves and the cylinder walls.

 

that just makes a 1.5mm lip ring at the top of the cylinder

what do you mean by make a 1.5mm lip??????