Lou's weight has always been all over the place. He's gone as low as 220 pounds and as high as 325 pounds or thereabouts. This is from memory having read up on him in magazine interviews and articles. BTW, the man was 6'4"-6'4.5" at his peak. Is probably 6'3"-6'3.5" nowadays (he has lost height). Here are his weights through the years:
1970 - 220 pounds
1971 - 315 pounds
1972 - 221 pounds
1974 - 264 pounds
1975 - 268 pounds
1976-1981 - 275-280 pounds
1982-1983 - 262-271 pounds
1984-1986 - 250 pounds
1987 - 220 pounds
1988-1990 - 270 pounds
1991 - 315 pounds
1992 - 298 pounds
1993 - 318-325 pounds
1994-1996 - 298 pounds
Since then his highest weight has been 285-287 and second highest has been 270 pounds, but in general he is MAX 250 pounds nowadays.