humm?? odd ive had like 4 71 318s and a 70 appart looking for the little rods. i only ever found them in the 2 68 motors ive had apart. all the 71s did have floating pins, i believe that stoped for 72 unless it was a hd truck motor..either way ive proven the skiny ones if balanced will go to 6500 all day long all season long and never cause a problem. I actually re geared that motor for one race so it would spin 7300 on paper, but it could only breathe well enough to pull about 6900 so it slowed me down..there would possibly be worrys with the slugs that goody has already beat up, but if the rods are round they will hold up.