The FH 451v has 494 cc and the FH 430v has 431cc. Here is the link. http://www.kawasaki.com/kengine/index.html They are both 15 hp. The 494 is the one that looks just line the 17 hp engine. A new 48" Lesco that I am looking at has the FH451v, which makes me a little leary. Any thoughts on the difference in cc's. Thanks.