[oldeerslayer]

Well you tell me the engine code is 10243880

Block casting number 10243880's were used from 95-00 Could be from a 95 C/K or van with TBI. That would explain the smog era heads.
That block was also used during the late 90's for almost all GM 5.7 crate motors. Including replacement engines for trucks dating back to 86. It was about the only 5.7 block made from 95-00. On the plus side it was also used for ZZ4 crate motors. But those had TPI aluminum or fast burn GMPP heads.
Take our collective word for it, that's not a Vortec L31. Between the 3 primary responders we probably have over 100 years of experience with S10's and first gen SBC engines. At first glance we all said it's not a Vortec. There reaches a point when you got to let an idea go. Whoever told you it was a Vortec obviously doesn't know Chevy V8's. Doesn't matter if the intake was added later. Everything else about the engine is all wrong. Particularly the heads, the parts that makes a Vortec better than earlier heads, which were designed for purely keeping EPA and CARB happy.
If you really want to build a good engine get some AFR or Dart heads. Way better than Vortecs. Which were the go to street head 25 years ago. Problem is they aren't any good above 5500. Today if it isn't making 600 HP at 6500-7000 it's a grocery getter. Built LS engines go 8000 no problem. Where the heads in the pic would be hard pressed to ever reach 5K or 300 HP.

 

[steve 96]

My 1982 Trans Am has that intake.
LG4 with an E4ME Quad on it.
To answer the original question.

 

[Rhotpursuit]

My 1982 Trans Am has that intake.
LG4 with an E4ME Quad on it.
To answer the original question.

That's great...what brand is it??

 

[steve 96]

GM, its aluminum.
Same sensor ports and ridges

 

[oldeerslayer]

If it's got those funny little ridges on the runners and is GM, then the part number under the orange strap will be 8 digits.
Once you have that number it's been identified. GM could have used an after market manufacturer, but would have their part number on it.
What is the number on your T/A's manifold?

 

[gmorin07]

Well thank you all very much.

 

[xx_ED_xx]

even the timing cover gives away the block isnt what you think it is stamped steel cover heads and intake all lead to an earlier engine, with the power of the internet it is easy to figure out

 

[gmorin07]

I did use the all knowing internet and it said it was a 96-2000 block and a vortec. If you don’t think so search yourself 10243880

 

[gmorin07]

 

[Gen210]

 

[03blackdime]

10243880 Casting

Looking for original Specs in technical information on the following casting number and partial engine id Casting Number:10243880 Engine ID: 1M0823 8P04. The following is what I've come up with (not sure if accurate). It's a small block Chevy built in Mexico somewhere near August (or possibly...

www.hotrodders.com

Read post number 5. That block casting is used for numerous combinations(yes the Vortec was one but not the only). Again if I would have bought that engine under the impression is was supposed to be the Vortec 350 I would be upset as its really not. You really need to pull the valve covers and see what head casting you have. But if your happy with what you have then great who cares but it is NOT a Vortec and that will matter when it comes to buying replacement gaskets and such.

 

[gmorin07]

10243880 Casting

Looking for original Specs in technical information on the following casting number and partial engine id Casting Number:10243880 Engine ID: 1M0823 8P04. The following is what I've come up with (not sure if accurate). It's a small block Chevy built in Mexico somewhere near August (or possibly...

www.hotrodders.com

Read post number 5. That block casting is used for numerous combinations(yes the Vortec was one but not the only). Again if I would have bought that engine under the impression is was supposed to be the Vortec 350 I would be upset as its really not. You really need to pull the valve covers and see what head casting you have. But if your happy with what you have then great who cares but it is NOT a Vortec and that will matter when it comes to buying replacement gaskets and such.

I am replacing the heads now anyway…but at least I got a good price on the engine so I guess it is what it is lol.

 

[gmorin07]

 

[steve 96]

ODS I am sorry it took so long, busy day yesterday. Same number on my 82, 84 and OP

 

[gmorin07]

ODS I am sorry it took so long, busy day yesterday. View attachment 369059 View attachment 369059

That is it

 

[oldeerslayer]

So now we know it's an 82-84 Trans AM intake. Which is surprising because those were most likely the old 010 two piece seal blocks and perimeter bolt valve covers. And contrary to the urban myth 010 is the last 3 of the casting number 3970010. It does not mean it's 10% nickel, but you'll find guys who will argue that is what it means till the day they die. I grew up less than 10 miles from the Tonawanda engine plant and have numerous relatives and neighbors who worked there. They laugh when they hear the 10% nickel story.
All of which is irrelevant since you have an 880 block.
You need to remove one of the center 4 intake manifold bolts to see if the holes were hogged out so that the earlier intake could be used on 87-95 centerbolt valve cover (TBI) heads. Those bolts have a different angle on the later heads.
Pre 96 are at the same angle as the rest if the bolts. In 87 they stood up those heat riser area bolts to a more vertical angle and were no longer perpendicular to the gasket surface. The work around was to oval the holes. At one time you could buy tapered shims to cover the ovaling and make the bolts apply proper pressure. W/o them the bolt heads need a thick washer since they'd dig into the intake while tightening. Looks like Jegs still has them:

https://www.jegs.com/i/JEGS/555/513026-1/10002/-1?gclid=CjwKCAiAvK2bBhB8EiwAZUbP1LC32H8rs9mvxiUL0EeXt-t0vvpE3nlnjzvtIJ5SoVwUT94Z9zwzEBoCsO0QAvD_BwE

87-95 heads

On many late-model heads from 1987- on, the center two intake manifold bolt holes are at a 72-degree angle instead of the 90-degree angle found on earlier heads. Your intake manifold must accommodate the correct bolt angles.

 

[cdoublejj]

for some reason that intake bore pattern reminds me of a quadrajet

 

[Rhotpursuit]

for some reason that intake bore pattern reminds me of a quadrajet

It does, but since it’s aluminum it may be on the “performance” end and had a Holley on it.

 

[gmorin07]

I don’t know lol I know I’m not keeping it.

 

[oldeerslayer]

Don't think a Holley's bolt pattern would line up w/o an adapter of some kind. Unless it was a replacement Holley spread bore carb. 4 1/4" x 5 5/8". A 4150 style Holley is 5.160" x 5.620"