mbrooks573
Active Member
Hey guys, just rebuilt the 273 in my 66 cuda and need a little help getting the holley tuned in. Basically a stock rebuild: Comp Cams Duration 250/260, Lift .432/.444, factory intake and exhaust, used a holley 390 CFM I had. Car idles and cruises great but does stumble a bit when I get on the gas. Overall, throttle response is not a crisp as it should be. Holley carb is at factory settings and I haven't changed any jets. Anyone tuned the 390 for a stock 273 rebuild with success? Thanks for the suggestions!