[1952henry]

I have heard of the earlier truck engines having this, but am unaware of this in the 8RTs. Not saying they didn't, but keep in mind that the 8RT went in everything from the F-1 (not likely to need "extra" performance) to the heavy load-carrying F6. Since the engines were externally identical, with perhaps an added goveror, it would seem a hassle to keep track of relieved and unrelieved engines as they were shipped out. I have a 19,000 mile 8RT engine that is decidedly not relieved.