blue gray help

[ZERO25]

I had my best finishes in my BG with a 200/500 stack on RF 700@RH, 1650-1700@4”, 14.0-14.25 drop on LR with the bolt in underslung as wall art and used a travel limiter, along with running a shorter .5” shorter driveshaft to help keep from bottoming our in transmission, 225 w/1 rubber RR 375# @RH, Air or 80# spring on LR 220#@24.5”, 5th coil shortest setting 425# spring, j bar up 1/4” on frame

What kind of motor with that 425 5th coil?