First off if you have a 310 then call LRD and get a cool head that is designed for big bore kits. Also sometimes people get cool heads with out head stays because they have had engine work done that changes the height of the jug and causes the head stay to not fit. I beleive that the head stay is important and i would never order one without it.
~Roost-U
1985 ATC 250r
Ported & Polished,
LRD/Pro Design Cool Head with 20cc dome
RAD Valve
FMF Fatty/Power Core
K&N w/ Outerwear (for the dunes) Uni for everything else
+2.5 swingarm
+4 axle
Desert Tank
Shreders
PB Block Off
Full PRM Skid plates
Turbo GSXR 750 Motor going into something....something FAST!
When they ask why I unloaded both clips on the guy, my reply "I was scared"