Motor ID question

[65Gregg]

How can I tell the difference in a 4.8 and a 5.3 without pulling the heads? Can I tell anything by pulling the pan? I have a chance to do some trading for what I'm told is a 5.3 but from what I understand you can't tell the difference externally. Thanks in advance for the help.
Posted via Mobile Device

[JNJchev77]

Pull spark plug #1 and, with a small flash light/led shine it into the plug port and look at the piston top, while rotating the engine. If it's flat, it's a 4.8. If it's dished 5.3

[Jdubs71]

Originally Posted by 65Gregg

How can I tell the difference in a 4.8 and a 5.3 without pulling the heads? Can I tell anything by pulling the pan? I have a chance to do some trading for what I'm told is a 5.3 but from what I understand you can't tell the difference externally. Thanks in advance for the help.
Posted via Mobile Device

Take a look at these previous threads covering this topic:

http://67-72chevytrucks.com/vboard/s...d.php?t=412173

http://67-72chevytrucks.com/vboard/s...d.php?t=530621

[65Gregg]

Thanks everyone, this gets me going in the right direction.
Posted via Mobile Device

[osaltyone]

I think pulling the pan is another option. I ran the #'s on the crank and it helped me, but there is always the chance of messing up the pickup tube o ring when you reinstall it.

[65Gregg]

My 5.3 was delivered this weekend. I was able to determine what it is based on the information given to my original post, THANKS. I have a couple of questions though. The intake has a DBW throttle body and the steam tube fitting has 2 connecting points and the tube from the block is designed for 1 connection. Can anyone ID the intake? The engine is an 02 accordingto the casting #s on the block, isn't that prior to DBW?

[osaltyone]

I think 02 had DBW. Where did you find the casting # on the block and how could you tell it was an 02 from them? I have been trying to figure out mine. That fitting in the intake is for the steam port. It should go to the radiator or radiator hose if you buy the fitting that goes in the hose and has a barb on it.
Posted via Mobile Device

[65Gregg]

The casting number is on the rear of the block on the passenger side. The second digit is supposed to be the year #.

[ls1nova71]

That is a 2000-2002 DBW throttle body. The engine probably came out of a higher end SUV rather than a pick up. 2003 is when all the pick up and SUV's got DBW standard across the board. Did you get the harness, PCM, TAC module and pedal for it too? The reason I ask, is because they're specific to the 2000-2002.

[65Gregg]

Originally Posted by ls1nova71

That is a 2000-2002 DBW throttle body. The engine probably came out of a higher end SUV rather than a pick up. 2003 is when all the pick up and SUV's got DBW standard across the board. Did you get the harness, PCM, TAC module and pedal for it too? The reason I ask, is because they're specific to the 2000-2002.

No such luck, with that said I guess I have the option to either chase down the correct harness for the intake/throttle body I have or I could look for a DBC intake and harness. Needless to say this is new territory for me, any suggestions or ideas?

[JNJchev77]

If you switch to DBC, ZI don't think you don't need a new intake. Yours looks like it has the provisions for the cable support on top of the intake toward the TB. The DBC TB will be a direct repl.

If your intake doesn't have the bolt holes for the cable bracket support, you can add them easily, do a search for switching dbw to dbc... if you want to go that route and can't easily find the pedal assembly to match.

[lowrider095]

It's all good sometimes I come off strong minded
Posted via Mobile Device