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I am doing an LS swap, 98 Chevy Silverado engine, LS3 5.3 Vortec that is in my 1957 Chevy 3100. I am in the last stages of getting the engine running but need some help to figure out these last few open connections.
Question #1
Steam port valve on front of head (right)
Open valve on top of water pump (left)
Do these connect ? If yes, what kind of hose ?
Question #2
Open port on passenger side of intake manifold (Truck intake)
What does this get connected to ? or capped ?
Question #3
Port on top of Intake manifold - passenger side
What does this get connected to ? or capped ?
Question #4
open port, rear end of drivers side cylinder head
Where does this connect ? Should it be capped ?
Question #5
open tube - passenger side of cylinder heard cover - looks like a steam port ?
What is this for, where does it connect ?
You sure about that engine? No LS3 5.3. Maybe LM7 or L59?
Plus, LS-type truck engines didn't arrive until the 1999 model year.
Knowing the right type and year will help when getting parts.
Now that underlord has ID'd your connections, look up a PCV diagram for your engine (see above).
Looks like you have quite the mix & match front accessory drive system going on in there. I see a short water pump, for Vette or F-body, with aftermarket adapters to space it out for the truck spacing; and some aftermarket alt bracket. There's a non-factory hose nipple in the one, which you may or may not need. Stock, the one on top of the block next to the driver's side head went to the throttle body when this motor was in its old home; from the pass side of the TB to the coolant recovery bottle, which was pressurized; from there to the port on the radiator right below the rad cap. Best routing and hookup will depend on what all of that you are using, or what you're doing in its place. If you're not running the stock truck recovery bottle, hook the 2 ports together, and hook a regular non-pressurized recovery bottle to the port on your rad.
PCV valve (fits in there)
Vacuum lines to whatever in the truck needs vacuum; in your swap; might include for example, heater controls and wipers
PCV valve. That's the "dirty" side; the engine sucks nastiness out of there to be disposed of. The valve plugs into that hole. The hose coming out of it goes to #2.
PCV clean air inlet. Since you have some aftermarket throttle body on there and I can't see the whole setup, not sure exactly what you should do with it. Stock, it went to the TB, in front of the blade, but behind the MAF, so that all air that went that way: into the valve cover, through the engine, back out through the PCV valve, into the intake. This is necessary in a MAF system, otherwise unmetered air (air that hasn't gone through the MAF) ends up in the intake, and the ECM doesn't know it's there, therefore doesn't provide fuel for it, which causes all manner of weird problems especially at idle. Which is why people who run those stoooooopid "breathers" because they "look cool" and "all the fast cars have that", end up with endless idle problems. Again, exact best hookup is going to depend on what all else you have going on in there, for that whole system.
98 truck didn't come with LS3. LS3 is 6.2L, was introduced in about 08, and is found in Vette and Camaro and such. It was aluminum in any case, but your block is cast-iron, so it can't possibly be that. 98 truck would have come with LM7 5.3 or LR4 4.8. Impossible to tell which from outside. You can look in a spark plug hole with your borescope though: if the pistons are flat-top, it's 4.8; if dish it's 5.3. If you have the VIN for the vehicle it came out of, T is the LM7 code, V is LR4.
In #4 there's a hose coming out of the rear of the intake. Where is that going?
You sure about that engine? No LS3 5.3. Maybe LM7 or L59?
Plus, LS-type truck engines didn't arrive until the 1999 model year.
Knowing the right type and year will help when getting parts.
Now that underlord has ID'd your connections, look up a PCV diagram for your engine (see above).
but LS3 5.3 as Lynda so mucH barttera, lol. Plus, that’s wh5 he paid for. Ha.
Lots of misinformation so far.
98 truck didn't come with LS3. LS3 is 6.2L, was introduced in about 08, and is found in Vette and Camaro and such. It was aluminum in any case, but your block is cast-iron, so it can't possibly be that. 98 truck would have come with LM7 5.3 or LR4 4.8. Impossible to tell which from outside. You can look in a spark plug hole with your borescope though: if the pistons are flat-top, it's 4.8; if dish it's 5.3. If you have the VIN for the vehicle it came out of, T is the LM7 code, V is LR4.
98 trucks didn't come with ANY LS type of engine. See post #4.
Thanks for all your input. This is a truck LM7 5.3 motor.
dfdfds
Below is a picture of the full motor. I am running a Camaro water pump in front which moved my radiator intake to the passenger side.
#4 hose coming out of the rear is going to the brake booster.
If there is any different advise seeing all the pics, please let me know. It's very appreciated. This is my first LS Swap
Tap on spacer behind Camaro water pump. Assume that connects to crossover valve ?
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LS Swap help with connections 
