Rover V8 EFi cylinder heads, taken from a Rover SD1 Vitesse. These are bare heads with no valves, springs, etc. These heads have been partly worked on, someone has opened up the inlet ports on both heads. One head has the exhaust ports opened up, and some work has been done on removing material from the inside face around the valve seats. The other head has had the porting area marked on the exhaust ports, but it hasn't been carried out, and the inside face around the valve seats hasn't been touched. So, in short, if you open up the exhaust ports and remove some material from around the valve…

Rover V8 EFi cylinder heads, taken from a Rover SD1 Vitesse. These are bare heads with no valves, springs, etc. These heads have been partly worked on, someone has opened up the inlet ports on both heads. One head has the exhaust ports opened up, and some work has been done on removing material from the inside face around the valve seats. The other head has had the porting area marked on the exhaust ports, but it hasn't been carried out, and the inside face around the valve seats hasn't been touched. So, in short, if you open up the exhaust ports and remove some material from around the valve…

Rover V8 EFi cylinder heads, taken from a Rover SD1 Vitesse. These are bare heads with no valves, springs, etc. These heads have been partly worked on, someone has opened up the inlet ports on both heads. One head has the exhaust ports opened up, and some work has been done on removing material from the inside face around the valve seats. The other head has had the porting area marked on the exhaust ports, but it hasn't been carried out, and the inside face around the valve seats hasn't been touched. So, in short, if you open up the exhaust ports and remove some material from around the valve…

Rover V8 EFi cylinder heads, taken from a Rover SD1 Vitesse. These are bare heads with no valves, springs, etc. These heads have been partly worked on, someone has opened up the inlet ports on both heads. One head has the exhaust ports opened up, and some work has been done on removing material from the inside face around the valve seats. The other head has had the porting area marked on the exhaust ports, but it hasn't been carried out, and the inside face around the valve seats hasn't been touched. So, in short, if you open up the exhaust ports and remove some material from around the valve…

Rover V8 EFi cylinder heads, taken from a Rover SD1 Vitesse. These are bare heads with no valves, springs, etc. These heads have been partly worked on, someone has opened up the inlet ports on both heads. One head has the exhaust ports opened up, and some work has been done on removing material from the inside face around the valve seats. The other head has had the porting area marked on the exhaust ports, but it hasn't been carried out, and the inside face around the valve seats hasn't been touched. So, in short, if you open up the exhaust ports and remove some material from around the valve…