how to identify a 5.3
how to identify a 5.3 I am trying to make sure the motor I am looking at is definitley a 5.3. it is from a wrecked 2006 Tahoe and the number on the motor is 515SX6380776
is there a sure way to tell if it is a 5.3 and not a 4.8?
is there a sure way to tell if it is a 5.3 and not a 4.8?
no sure way to telll what it came out of, it is suppose to come from a 2006 tahoe. the person selling it bought it from a salvage company and never used it so all i have is the motor and trans sitting on the ground. it does have the harness and ECM any clues there. if i run the ECM part number would that tell me? the motor/trans looks nice with only 50 miles on it but I want to make sure I am buying a 5.3 and not a 4.8
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It actually says 4.8L/5.3L on both the front and the back. The only ways to tell are to:
Look at the tops of the pistons, as already mentioned, and
Measure the stroke of the crank, as already mentioned.
A 4.8L has a 3.268" stroke, 5.3L is a 3.622" stroke.
The difference is made up in the rod. The 5.3L has a 6.100" rod and the 4.8L has a 6.267".
Look at the tops of the pistons, as already mentioned, and
Measure the stroke of the crank, as already mentioned.
A 4.8L has a 3.268" stroke, 5.3L is a 3.622" stroke.
The difference is made up in the rod. The 5.3L has a 6.100" rod and the 4.8L has a 6.267".
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As Schwanke said, the block is stamped 4.8/5.3 on the front and the back. GM identified them with a paint splotch on the corrosponding number, but if the motor is old/nasty/greasy, it may be hard to see.
If your certain the PCM is the original PCM with the motor, it could be read to see if it has a 4.8 or 5.3 cal inside of it, otherwise the hardware for the pcm is the same for both.
If your certain the PCM is the original PCM with the motor, it could be read to see if it has a 4.8 or 5.3 cal inside of it, otherwise the hardware for the pcm is the same for both.
It actually says 4.8L/5.3L on both the front and the back. The only ways to tell are to:
Look at the tops of the pistons, as already mentioned, and
Measure the stroke of the crank, as already mentioned.
A 4.8L has a 3.268" stroke, 5.3L is a 3.622" stroke.
The difference is made up in the rod. The 5.3L has a 6.100" rod and the 4.8L has a 6.267".
Look at the tops of the pistons, as already mentioned, and
Measure the stroke of the crank, as already mentioned.
A 4.8L has a 3.268" stroke, 5.3L is a 3.622" stroke.
The difference is made up in the rod. The 5.3L has a 6.100" rod and the 4.8L has a 6.267".
thanks for all your info. one more question how big are the numbers cast in the block? and would I have to remove anything to see them? I have a 5.3 in a truck at work and was going to see if I could locate the marks
thanks again, it sould not be to hard to remove the alt/ps bracket considering it is out of the vehicle. would you happen to have a pic of the casting marks? I know I am asking alot.
ive seen a few 4.8 and 5.3 engines the paint always seems to be wishy washy as to which motor it is, if u pull the pan the crank is pretty close to the windage tray on the 5.3 while the 4.8 has almost a half inch more clearance
