RICHARD had sent his head for porting(identical port castings with a slight difference in exterior machine work) but the motor is basically the same

the difference between the 5v head and the 4 valve head is HUGE, u can tell just in the timing changed with the 4 valve requiring 8+* less timing to make peak power, weve done a conversion from a 660raptor(5valve) then installed a 700(4valve) head and cylinder... power potential with ported heads was huge