Stallone's height has been in question since the beginning of his career. The Internet Movie Database lists him at 5"9 1/2', which is probably about two inches too much but at least he's not claiming to be a giant.
His noggin size: Casaba melon.
In his book With Nails Richard Grant says Arnold Schwarzenegger and Sylvester Stallone are:
"substantially shorter than 6 foot."
Here's a newspaper article that provides some insight:
Career setbacks aren't keeping Stallone out of the ring
BYLINE: Chris Garcia, AMERICAN-STATESMAN FILM WRITER
DATE: July 25, 2003
PUBLICATION: Austin American-Statesman (TX)
SECTION: Movies
Stallone appears tan and fit on this day, his shirt sleeves stretched taut around softball-sized biceps. It's said Stallone stands between 5-feet-8 and 5-feet-10, which looks about right. While that's the average height of a grown man, it's apparently Lilliputian to spectators who want their screen heroes bigger than life.
