yes they are ovl ports but with some work they will be fine builder was think they would have more torque at the end of the track so it wont fall on its face
yes they are ovl ports but with some work they will be fine builder was think they would have more torque at the end of the track so it wont fall on its face
The 781 oval ports will give you more torque and lower end power. Put some bigger valves and some port work and i think these heads will work better than the 990 heads. Good luck ejm and have some fun.
check your exhaust gas temps
check the timing it maybe running rich and the timing may be too far retarded most common cause is not enough timing and too much fuel