* Small-block V8s: Common options were the 350 cubic inch (5.7L) and the 400 cubic inch (6.6L). There might have been variations within these engine families regarding horsepower and torque outputs.
* Big-block V8s: A 454 cubic inch (7.4L) was also available, but less common than the smaller V8s.
It's impossible to definitively say *which* engine was in *any* particular 1976 C1500 without knowing the truck's specific VIN. The engine size would be indicated on the VIN plate or the engine itself (though that might be difficult to read after 40+ years).
