[sprintbird]

My experience with my stock 230 Sprint with 1 7/8" duals was that it would rev, but no real power past 4500 ish rpm. When I rebuilt the engine and made it a 255 with an H cam and 230 Sprint head. I dynoed the engine to see what power it actually made. The peak HP was right at 5000 rpm and started tapering from there. We did not pull it past 5500, as there was no reason to. This was with the H cam, retarded 3 degrees, and shorty headers. The dyno operator told me the engine wanted more cam. (bigger) So if I were building one today, it would get a bigger grind and free flowing exhaust. (no stock Y pipe) Just my 2 cents.