All 1956 and 1957 9000 and 10000 series trucks and school busses came with the 322, there was no other engine available for these trucks. The only option available to the buyer was 2-barrel carb or 4-barrel carb.
The "Loadmaster" 2-barrel motor has 195 hp, 310 ft lbs of torque and 7.7:1 compression.
The "Super Loadmaster" 4-barrel motor has 210 hp, 320 ft lbs of torque and 7.7:1 compression.
They also had "hardened valve seats".
I have one in my 1957 Fire engine and one in my 1956 LCF (not running yet).
Mike B
