87chevyG30 5.7lV8 core plug removed w/out taking out engine?

https://www.youtube.com/watch?v=ouxbxE-BMNY

https://www.enginepartsonly.com/2005-kia-optima-2-7l-engine-expansion-plug-kit-fps136-29/
https://partsology.com/freeze-plug-set-brass-kia-hyundai-sportage-tucson-tiburon-santa-fe-optima-sonata-99-10-2-5l-7l-fps136

There are "CORE" plugs (their real name) at the back of the cylinder heads. I don't think there are any block core plugs between the engine and trans

Dear Connie,
This depends on the year, make, and model of your vehicle.
Some engines are installed longways to the car, some crossways. That matters.
A stuck thermostat will not leak water.
(It can, however, cause water to leak , sometimes violently!)
Thermostats are inside metal housings.
Water pumps can leak water, out the "weep" hose in the casting. Water spewing out of the engine could also be a cracked or burst radiator hose or heater hose.
On a few cars, mostly older ones, it can also be a leaking or burst "freeze plug", also called a "sand plug".
God bless your efforts.

If motor mount is in the way, yes, there is a freeze plug in that vicinity. links below show and tell how to.
press the helpful button.

Replacing Freeze Core Plugs In My Truck Part 1

Freeze plug removal 94 150 by an 11year old part 1

Freeze PlugsAlso called Engine Block Expansion Plugs

Leaky Freeze Plug Ford F150 Forum

Freeze Plug Installation on Jeep Cherokee Sport

Hello,

On an engine block there are 'Freeze plugs'. The reason for freeze plugs is to allow for expansion (E.G.--when water freezes it expands). If water does get cold enough or does not have enough antifreeze in the system the water will expand and 'pop' a freeze plug to prevent the engine block or heads from cracking. However--these plugs can fail (not cold related) causing a leak in the cooling system. Thus water circulates through the block and heads to provide cooling (water pump-radiator-heater core). Also--water pumps when they go bad have a hole that 'pops' and leaks to let you know the water pump needs to be replaced. Therefore--Location is key.

I hope this helps.

• When your heater core leaks it will not leak in the engine bay. The heater core is behind the dash and will make the passenger side floorboard wet. Also the windows will fog when on defrost and a sweet smell will take over the cabin. I don't suspect the heater core. BUT the heater core hoses are against the firewall and one could have cracked a leak. You will notice this though. You will see two smaller hoses going into the firewall on the passenger side of the vehicle. If they are leaking they are an easy spot.

• Your water pump is more in the mid section on top of the belt drive system. Water could be splattering back there but if you see it steadily leaking from back there with the vehicle off then I would not suspect the water pump.

• Freeze plugs are where the engine sits as it is cast, when being made. The holes that are left when the engine is lifted after casting are where the freeze plugs go. This is where the antifreeze circulates around the block to keep the engine cool. This is what I suspect is the problem. If that freeze plug is accessible the you can replace it no problem. If it is not then you may have to take it to a repair shop so they can lift the engine up a bit and replace it.

• Hope this helps and thank you for using FixYa.

Regards, Tony

The freeze plugs can be loosened and removed using a punch and a hammer. Or, drill a small hole in the middle of the freeze plug, then thread a large sheet metal screw into the hole. Remove the plug with a slide hammer. When installing, coat the freeze plugs with sealer. Tap into position using a piece of pipe,socket slightly smaller than the plug, as a driver. location back of engine

If i recall correctly Freezeplugs are press fitted so your going to have to clean it up get it in and probbly hit it a bit iwth a hammer lol.

But If thats caused the freeze plug to come out you may of damaged things like your radiator, heater core etc i suggest a garage takes a look at it cause it may be a DIY headache

Your engine is water cooled and therefore has water travelling around the engine block. 
A freeze plug is an expansion plug located in the side of an engine block that is supposed to protect the block against freezing conditions. Water expands when it turns to ice, and if the coolant does not have enough antifreeze protection it can freeze and crack the engine block. The freeze plugs (there are usually several of them) are supposed to pop out under such conditions to relieve the pressure on the block.
Most of the plugs to be found on an engine are actually to plug the holes where sand cores have been held. The sand cores are used in the casting process to form internal cavities in the engine block or cylinder head, for cooling water for example, and so should really be referred to as core plugs.

Freeze plugs can often be a source of troublesome leaks as a result of internal cooling system corrosion. Ease of replacement depends on accessibility. In many cases the plug area will be difficult to reach and using a mallet to perform maintenance or replacement will be nearly impossible without special facilities. Expanding rubber plugs are available as replacements when access is a problem.
Hope that helps...