The valve seat in an internal combustion gasoline or diesel engine is the surface against which an intake or an exhaust valve rests during the portion of the engine operating cycle when that valve is closed.
For Isuzu FVZ & FVR model trucks with the 6HK1 engine.
This is a main big end for the Isuzu FVM and FTR model truck. A big end is the end of a connecting rod that engages with a crankshaft. The top end of the connecting rod is called the small end, and the bottom end is called the big end. He crawled under the engine every 15 miles or so to examine the big end for overheating.
The con-rod connects the piston to the crankshaft to transfer combustion pressure to the crankpin. There are bearing portions at both ends, the piston side is called the small end, and the crankshaft side, the big end.