I run Lucas 20/50 in my 461. I would say stay with the 20/50Sent from my iPhone using SoCalJetBoats mobile app
Do you run synthetic? Does a roller cam still need the extra zinc like a flat tappet does?
Ive ran the racing oil since i built the motor in 2011 http://www.jegs.com/i/Lucas+Oil/639/10378/10002/-1?CAWELAID=1710569222&CAGPSPN=pla&catargetid=230006180000514867&cadevice=c&gclid=CLmSmrzfuL4CFceCfgodqSwA4ABut for a normal deal i would say the synthetic would be just fine.