These patrol variants are known in the west as Whiskey I, II, III, IV, and V and were called Project 613 in the Soviet Union.

It was a regular Whiskey class modified with a launch tube aft of the sail containing a single SS-N-3c.

The boats of the single and twin cylinder class also had to raise their missile tubes, which were normally positioned horizontally.

The "Long Bin" boats did not handle well, with the launch tubes causing stability problems, and water flow around the missile fittings was very noisy.

Some were converted to Project 640 radar picket boats (called Whiskey Canvas Bag in the West).

Vice Admiral Burov, head of the Soviet Defense Ministry's Shipbuilding Institute from 1969 to 1983, confirms 215 units built.