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Accelo · 03-17-2023, 01:46 PM

The 5.3 and the 4.8 look the same from the outside. It the motors are in the truck you can check the Vin for the motor displacement. Otherwise you have to look at the top of the pistons. The 5.3L's have a dished piston, 4.8's are flat. That way GM could use the same cc heads on both motors. The 6.0L is cast into the block. Watch for Escalades and the like for the big motors. Also more likely to have DOD installed. This can be deleted. If the motor has a drive by cable it is likely from the early 1999 and the early 2000. More likely to have high mileage. Learn the what the different generation ECM's look like. This will get you to the General year and motor series.
Happy hunting.

03-17-2023, 01:46 PM	#4
Accelo Registered User Join Date: Mar 2015 Location: washington Posts: 2,169	Re: Junkyard LS The 5.3 and the 4.8 look the same from the outside. It the motors are in the truck you can check the Vin for the motor displacement. Otherwise you have to look at the top of the pistons. The 5.3L's have a dished piston, 4.8's are flat. That way GM could use the same cc heads on both motors. The 6.0L is cast into the block. Watch for Escalades and the like for the big motors. Also more likely to have DOD installed. This can be deleted. If the motor has a drive by cable it is likely from the early 1999 and the early 2000. More likely to have high mileage. Learn the what the different generation ECM's look like. This will get you to the General year and motor series. Happy hunting. Last edited by Accelo; 03-17-2023 at 01:52 PM.