Carl - Your friends "LAA661236" is the serial number for a 1953 Passenger Car (models 15-21-2400) "Regular 235" according to the info in the
1953 Truck Data PDF from the GM Heritage Center. The 1st pic below provides that data.
The 2nd picture below, taken from the 1953 Passenger Car Data PDF, provides the full "Engine Lubrication System" description. The only engine oil splash lubrication described involves the cylinder bores and piston pins.
