i know u can on the newer ones, but can u swap from 2;1 to 2.3:1 on the older ch-3 boxes that are stamped for 400hp instead of 600hp ? if so, then i think this will be my cheapest way to make more power without going into my old engine.

this may be what i need to do if it's possible. i used the search option but no luck.



thanks,
jopete

My CH3 is 14 years old and stamped 400Hp,Ididn't have any trouble changing over to 2.3:1. (lower unit and belt)


Call century with your serial# before you spend the $ just to be sure.

Century Drive Systems, Inc.
1884 Allegheny Blvd. Bldg 16
PO Box 412
Reno, PA 16343

Phone: (814) 677-7100
Toll-Free: (866) 679-4200
Fax: (814) 677-7102

thanks MB, that is exactly what i will do!!!!!!!!!!