[Marcello]

"Whence at you such data on SU-7BMK?"

A piece here and there on the internet.

"Usually on all series Su-7 - 2 fuel tanks were established only. About 4 fuel tanks I have found nothing."

I have rechecked my notes. What I found is that
fuel tanks could be carried on the two under fuselage pylons and starting from the SU-7BM even on the two inner underwing pylons. But you are correct, four fuel tanks was a "ferry" configuration and usually was not done in practice.

"Su-7BMK - Had 8 hardpoints. Su-7BMK - differed from Su-7BKL older equipment. The truth is written that Egyptians without the permission - modernised Su-7BMK and have increased quantity hardpoints to 8 pieces. Then the USSR and made them with 8 hardpoints = 3300 kg."

When was this carried out?