I would think there is , but I only ever order this 3 times, the 1st one I received didn't have exhaust bolts holes drilled and both ends of the head were not drilled for oil drain back, the 2nd 2 were drilled for drivers side exhaust and had drivers side drain back drilled in the rear of the head, also one of the pair had the last exhaust bolt hole broken in to the oil drain back. I used that for the passenger side, tapped and plugged the drain back that was now in the front.