A friend of mine (who lives on a farm) bought a Massey Fergusen combine
that was made in 1974. This thing is powered by a Chrysler Slant-6 (225
My first car (which was at the time a 20-year-old 1965 Dodge Polara) had
a slant-6 and I rebuilt it once or twice during the 10 years that it was
my daily driver.
I know that the theory was that leaded gas helped lubricate the valve
seats, and unless you did a valve job and had the valve seats hardened,
that the use of unleaded was supposed to wear out the valve seats on
So I'm wondering if anyone knows if a 1974-vintage slant-6 could run on
unleaded gas (or what-ever passes for gasoline today).
I looked through the manual for this combine - and it says absolutely
nothing about the recommended gasoline - not even the octane.
I seem to recall that in the 1990's that you could get a can of additive
to throw into your tank to substitute for leaded gas - I have no idea if
that stuff is still available.
- posted 8 years ago