whats the difference between these 2 heads if nothing was in them like no valves, springs, shafts.....???

 

itr one is ported and polish while GSR isnt. itr IM has a single runner while GSR has 2.

 

Type r head is a ported pr-3 (b16) casting.Gsr head is an unported p-72 casting.
Glenn

 

type r has a oem port and polish

 

Sigh... I know this information more than likely exists in the archives.

1) The GSR has a smaller combustion chamber. You can check the numbers here:
http://www.c-speedracing.com/h...c.php
2) The intake ports on the GSR head angle downwards towards the block deck at about 10 degrees, the ITR head intake ports are parallel to the block deck. The respective intake manifolds are likewise angled.
3) The ITR head has dual valve springs on both the intake and exhaust side. (The ITR exhaust valve springs are identical to the GSR intake valve springs.) The GSR head has dual valve springs only on the intake side.
4) The ITR head has necked intake valves to reduce reciprocating mass and allow slightly more air flow.
5) Of course the ITR head has a slight port and polish from the factory in the vicinity of the valve seats.

That's all that I can think of right now. Check my signature and you can looks at the parts diagrams online.

 

gsr head yeilds higher compression when putting it oem pistons b16b, b18c