PROSTOCK ported 4 bolt top ends and upgrade kits were added to our catalog today. The first sizes available are the 30.5cc, 29.5cc and 27.2cc. http://www.oneillbrothers.com/rc-car/porting/prostock-ported-4-bolt-top-ends-upgrade-kits.html

For more info on our new PROSTOCK line please view the following link: http://www.oneillbrothers.com/blog/cat/news/post/prostock/