From Toyota Wiki

v • Toyota K Engine • e Toyota K Engine Timeline
Series	Version	1960s										1970s										1980s										1990s
		0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	6	7	8	9
K	—
	B
2K	—
3K	—
	D
	B
	C
4K	—
	U
	C
	E
5K	—
7K	—																								*not verified