 This had more powerful engines and was lightened, with seatback armour and one of the guns removed, while flap settings were adjusted to give greater lift at higher altitudes and a new pressure suit was introduced.These changes increased the aircraft's ceiling from to .The prototype MiG-19SV was further modified (as the MiG-19SVK) with increased wingspan, giving a ceiling of , but this was still inadequate to deal with the U-2, and effort was switched to adding rocket boosters.