* Crankshaft: Truck engines often have a stronger, more robust crankshaft designed to handle the increased torque demands of hauling and towing. Car engines prioritize higher RPM and horsepower, sometimes sacrificing some crankshaft durability for weight savings.
* Connecting Rods: Similar to the crankshaft, truck connecting rods are usually beefier to handle the heavier loads.
* Internal Components: Truck engines might have stronger internal components like pistons and camshafts designed for longevity under heavy loads and lower RPMs. Car engines often have lighter components optimized for higher RPM performance.
* Oil Pump: Truck engines often have higher-volume oil pumps to lubricate the engine better under strenuous conditions and higher oil temperatures.
* Compression Ratio: Truck engines might have a slightly lower compression ratio than car engines. This isn't always the case, but a lower compression ratio can be advantageous for using lower-octane fuel and for towing heavy loads.
* Casting Numbers: The casting numbers on the engine block will indicate whether it's a truck or car engine. These numbers identify the specific block design and its intended application.
* Accessories: While the engine itself might be the same basic block, the accessories bolted onto it (alternator, power steering pump, etc.) may differ based on the vehicle's needs. Truck engines might have larger alternators to supply more power for accessories.
* Exhaust Manifolds/Headers: Truck exhaust manifolds are often designed for low-end torque, while car manifolds may be tuned for higher RPM power.
Important Note: These are *general* differences. There's significant variation within both "truck" and "car" 350 small-block engines depending on the year of manufacture, the specific engine code (e.g., L48, L82, etc.), and the optional equipment specified for that engine. You can't always definitively tell just by looking at a 350 whether it's from a truck or car without checking the casting numbers or other identifying marks.
