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PHR MARCH/1971 THE 'NEW' 455 H.O. crate engine slides easily into your "OLD" Bird or GTO to liven it up, Milt Schornack turns the wrenches. I found the reference interesting on the 4th page caption under the pic of the two connecting rods - "super duty rods" ...don't know what they are referring to as the 455H.O. rod isn't anything special and the SD 455 rods are still two years away...what are they talking about?