1990 and above 6.2L and 1994 6.5L engines have the following new and revised parts:
*Cylinder Heads.
The 1990 cylinder heads have been revised to meet 1990 emissions standards.
Precombustion Valves.
The 1990 engine is equipped with reverse throat precombustion chambers.
Exhaust Valves.
The 1990 exhaust valves are coated with chrome to prevent burning and to
increase durability.
*Exhaust Valve Stem Seal.
The 1990 engine is equipped with a new exhaust valve stem seal that
is not available for previous model engines.
Cylinder Head Gaskets. The 1990 cylinder head gaskets have new circular combustion seals and
are made of a non-asbestos material.
Fuel Injection Pump.
The 1994 fuel injection pump has a TP sensor and a revised calibration
procedure.
Fuel Injection Pump.
The 1990 fuel injection pump has a new governor and a revised calibration
procedure.
*Fuel Injection Nozzles.
The 1990 fuel injection nozzles are shorter and are orientated ten degrees
from the vertical.
*Fuel Injection Lines.
The 1990 engine is equipped with high pressure fuel injection lines.
Fuel Injection Line Brackets. The 1990 fuel inject
That from the TM's there are also different rebuild lits for that pump ect.. if ypu want i have the Part #