Ok I am trying to figure this out the easy way and just ask h-t. Is there an set amount of milling that would take my stock gsr head from 41.7( I think,its late) cc's to 37.0 or so. I will cc the head afterwards to double check. Maybe a equation or something to get me close... Any help would be appreciated!

 

you just need to use basic geometry. figure out the area of the combustion chamber at the surface of the head, and multiply this by the amount you are milling off, and this gives you the amount of volume you are removing from the combustion chambers. pretty simple really.

 

Ok but I was hoping maybe someone might know of a easier way

 

around 0,5mm should get u there, my ITR head was 45 cc then milled 0,6mm it got me 40 cc

 

ok thanks I will give that a try, so .5mm you say?

 

I am pretty sure the gsr motors have quench zones, and the type r motors dont, which should drastically change the volume of the combustion chamber cross section between the two. If you mill it the same amount as he did, dont expect your combustion chamber volume to decrease as much.

 

Honestly, if you are going tomill the head you are going to need to properly CC the en gine so yo dont **** stuff up. On top of that wou will probably need to change the cam timing so they dont hit **** snow that they are closer to the pistons.

Did you already look into getting a thin head gasket?

 

I would talk to a reputable head shop like RLZ, portflow, because i really don't think you could accurately guesstimate the volume because of its irregular shape. But i'm sure the head shops have milled and CC'd enough heads to where they know what amount of milling will equate to what comb. chamber volume.

 

Yeah i know they make thinner head gaskets. I need a smaller cc on the head. I was hoping someone on h-t had done a milling to cc post before but i can't find one... I will be claying the motor anyways...