[Prof]

Thanks for posting this question. I am having Keith Craft assemble my roller 331 SBF and all the parts are due at the Plano TX location within a week. Dallas Mustang had a X303 on the shelf, so that's what I went with. I have a Thumper grind in my '50 street rod Chevy pickup (also SBF) and it revs freely without thought. I am going to call CompCams Monday morn and get one coming my way. In my opinion, the grinds are nearly identical. THANK YOU for posting the duration/lift numbers in your reply. Makes things go faster on the phone.
Paul May
Dallas TX