I have a Chevy 357" with 462 heads/ 2.02 valves, Comp 280 cam with 1.6 rockers. I bought a set of Canfield heads with of all things, 2.02 valves. They are usually 2.05 or 2.08. They have been ported big time professionally. Nice job. My question is to put them on my engine or sell them. I would think I'd pick up some higher end jump with the port job and still be ok at the bottom end because of the 2.02's. They would have to be better than the smaller runner 462's, but I have no experience with Canfields or aluminum hedas for that matter. If the general consensus is I'm better off with the 462's, I'll keep em up for sale. Any input would be appreciated.