From: 'DAVID HURD' via The 1962 to 1965 Mopar Mail List Clubhouse <1962to1965mopars@xxxxxxxxxxxxxxxx>
To: 1962to1965mopars <1962to1965mopars@xxxxxxxxxxxxxxxx>
Sent: Fri, Jan 25, 2019 9:21 am
Subject: Re: 1963 Plymouth for sale -- rare?
On mine, when we rebuilt and went threw the heads with all roller rockers, we lowered the compression ratio so we could use 93 octane premium fuel. That still was not enough. The engine would diesel at shut off. So I add 2 gallons of JP 109 to each tank fill up and am careful to never stab the gas peddle before shut off. That helps. 13.5 was a bit much with today’s fuels.