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.
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[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.
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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.
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[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.
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[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.

[65Gregg]

Thanks JNJchev77 for the help, I just located a DBC throttle body at a good price, free!!
That should make this easier,cheaper since I don't have to chase as many year model specific parts & pieces.

[JNJchev77]

Cool, if free is available I usually try to pay that way! ;P... Now all you need is the bracket for the intake. Junkyard or Dealer. Got mine at the dealer for like $14 bucks.

[lowrider095]

that pipe under the throttle body goes to the overflow tank , a trick that the ls1 guys do is to take a barb fitting and take both hose ends off the throttle body and put the barb fitting in the hoses, bypassing the hot antifreeze going into the throttle body

[ls1nova71]

The steam line (the one going to the throttle body) DOES NOT go to the overflow tank, it goes back into the radiator. Hooking it to the overflow will fill it up in a hurry. As stated you can bypass the throttle body if you live in a warmer climate, but if you live where it gets really cold, its supposed to keep the throttle body from icing up.
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[lowrider095]

You are right on the line going to the rad, I was thinking of my 05 silverado it doesn't have a radiator cap on the radiator it's on the overflow tank . But you are wrong that you have to use the steam pipes in the throttle body , if you look at the new throttle body's and bigger throttle body's like FAST 102 there not there
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[ls1nova71]

Originally Posted by ls1nova71

As stated you can bypass the throttle body if you live in a warmer climate, but if you live where it gets really cold, its supposed to keep the throttle body from icing up.
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Originally Posted by lowrider095

But you are wrong that you have to use the steam pipes in the throttle body , if you look at the new throttle body's and bigger throttle body's like FAST 102 there not there
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I don't think you read my message right.

[ls1nova71]

Also, I wasn't trying to be a jerk, or to bust your balls, but the OP stated that this is new territory for him, and I was just trying to keep the info as correct as possible. I'm not saying you were intentionally giving wrong information, but rather clarifying things so that he doesn't run into problems that he doesn't need to experience.

[lowrider095]

It's all good sometimes I come off strong minded
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