Re: 24:1 vs 50:1 in 64′ vs 65′ OMC engines Home › Forum › Ask A Member › 24:1 vs 50:1 in 64′ vs 65′ OMC engines › Re: 24:1 vs 50:1 in 64′ vs 65′ OMC engines dave-bernardUS Member - 1 Year (includes $3 online payment fee)Replies: 2014Topics: 30 August 17, 2018 at 10:38 pm #81379 castor oil in the alky motors.