As I understand it, the Redhead was an earlier engine than the Goldhead; my Goldheads and Redheads are all marked ".60".
The Goldhead is a 5 port engine, I think the Redhead is a 3 port engine but it has been a while since I looked at mine.

Flying Models has a detailed review of the FIRE Goldhead in the Dec. 1984 issue. I have seen NO such info on the Redhead, but would like to.

Jim