Im going to look at a 93 phazer for 10yr old sister, the owner says its very nice, e-start, 136x1.5 track etc....BUT it has a rod through the case. My question is are all the bottom ends the same from 84 to whenever they quit making that engine? Some people call them 480s, 485 and ive seen people call them 488 also. Did they really make that many engines for them through the years? Are all the bottom ends the same? Thanks!