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Message: <blockquote data-quote="Pure84GTT" data-source="post: 809879" data-attributes="member: 13927">I prefer the rod ratio of the 331 personally, There is no question to me that you should go with a custom camshaft ,as no matter what I can see you leaving 30-50 horse on the table with an off the shelf cam. bullet cam shafts and camshaft innovations are two very reputable camshaft experts. I can assure you they will ask you to switch to a single plane intake and they will also let you know what rocker ratio to run. I have been down this road, for as much as your spending its worth doing it right. Not to mention I assure you, your custom cam shaft will sound bad ass lolIf your not able to go 10.90s on motor with that combo your doing it wrong lol camshaft innovations has many 306 H/C/I customers going in mid 11s on motor with 4.30s and a good tire ofcourse</blockquote>