Help me identify my engine

[plik]

Yes, there are other threads on this, I apologize, but none have helped me.

This engine is not original to my 84 suburban. It has TBI, which means it either had a TBI ECM kit added to it, or it's 1989 or newer. It could have been pulled out of another vehicle, or it could be a crate engine.

I looked at the back, behind the driver-side cylinder head, and all I see is GM, the number 2, 5.7 L, and Hecho en Mexico. Notice that it's painted a light blue, isn't that odd?



And I've looked at the engraving at the front of the passenger-side cylinder head: 1M0818 6G35



And I've pulled off the valve cover. All I can see is that it was made in Mexico.



I haven't pulled off the oil pan yet to see if it's 4 bolts or 2 bolts. I'm hoping I don't have to, but I will if it helps.

The main thing I need to know is if it's a light duty engine or a heavy duty engine.

[csdineley]

Sorry I can't id that engine for you. Without the block / head casting numbers it's going to be hard to tell.

But Tbi started in our trucks in 1987.

As for the blue color.  From 1955-1975 all car and truck V-8 engines were "Chevrolet" orange and in 1976 they switched to "Chevrolet" blue till the mid 80s when they went to black...Think they went to black in 1985 but not for sure.

The Hecho en Mexico leads me to believe it's was a create engine at some point.

Heavy duty vs Light duty L05 (350 tbi) the main difference is the Heavy duty had a lower compression ratio. Back when my 87 3/4 ton truck with the 350 tbi was stock. It did have an air pump and an O2 sensor and catalytic converter.

If I remember right L05 head casting # end with 191 or 193

[plik]

Where do I find numbers on my engine to identify it?

[plik]

Sorry I can't id that engine for you. Without the block / head casting numbers it's going to be hard to tell.

But Tbi started in our trucks in 1987.

As for the blue color.  From 1955-1975 all car and truck V-8 engines were "Chevrolet" orange and in 1976 they switched to "Chevrolet" blue till the mid 80s when they went to black...Think they went to black in 1985 but not for sure.

The Hecho en Mexico leads me to believe it's was a create engine at some point.

Heavy duty vs Light duty L05 (350 tbi) the main difference is the Heavy duty had a lower compression ratio. Back when my 87 3/4 ton truck with the 350 tbi was stock. It did have an air pump and an O2 sensor and catalytic converter.

If I remember right L05 head casting # end with 191 or 193

One thing the guy said was he thought the heavy duty engines had neither an oxygen sensor nor an air pump.

Which I now realize completely contradicts the original issue, which was that the first guy who inspected the engine said that it needed an air pump (and he was assuming it was a heavy duty engine since it's a heavy duty suburban). 

Anyway, I need a resource -- something I can use to prove that my suburban is what it's supposed to be -- either a light duty truck with a light duty engine, or a heavy duty truck with a heavy duty engine.

Is there a website which I could use to look up my own VIN?

And even if I find my engine cast number, how can I prove that it's a heavy duty engine and not a light duty engine?

[Irish_Alley]

look for the gvwr rating on the door

[plik]

look for the gvwr rating on the door

8,600 lbs

[Irish_Alley]

so its above the EPA standards for emissions unless its from cali. so its "heavy duty".

[plik]

Thank you.

Now, how can I prove that my engine is heavy duty?

[csdineley]

would need the full casting / suffix / head numbers. That would help a lot.

[plik]

would need the full casting / suffix / head numbers. That would help a lot.

Where do I find such numbers?

[hatzie]

The head numbers are usually cast between the rocker towers.
http://www.mre-books.com/chevy/engines/parts_interchange/cylinder_heads.html

The block casting number is usually behind the LH cylinder head parallel with the bellhousing mounting face.
If all it has is GM and 5.7L you probably have an LO5 350.  The blocks with this cast behind the LH cylilnder head have the casting number behind the RH cylinder head.
http://www.mortec.com/location.htm

[plik]

The head numbers are usually cast between the rocker towers.
http://www.mre-books.com/chevy/engines/parts_interchange/cylinder_heads.html

The block casting number is usually behind the LH cylinder head parallel with the bellhousing mounting face.
If all it has is GM and 5.7L you probably have an LO5 350.  The blocks with this cast behind the LH cylilnder head have the casting number behind the RH cylinder head.
http://www.mortec.com/location.htm

I think you're right -- L05 350 -- it looks exactly like it (valve covers, I mean).

So, it's either one or the other:

http://paceperformance.com/i-6485019-12568758-5-7l-350cid-lo5-k-1987-1995-chevy-gmc-full-size-trucks-g-van-up-to-7200-gvw.html
or
http://paceperformance.com/i-6484911-12520270-5-7l-350cid-lo5-k-1987-1995-chevy-gmc-full-size-trucks-g-van-1996-2002-p-van-over-8600-gvw.html

I'll see if I can find the casting number, or just pull the oil pan -- it says that the 7200 gvw version is a 2-bolt main, and the 8600 gvw is a 4-bolt main.

Thank you so much!   

[hatzie]

The head numbers are usually cast between the rocker towers.
http://www.mre-books.com/chevy/engines/parts_interchange/cylinder_heads.html

The block casting number is usually behind the LH cylinder head parallel with the bellhousing mounting face.
If all it has is GM and 5.7L you probably have an LO5 350.  The blocks with this cast behind the LH cylilnder head have the casting number behind the RH cylinder head.
http://www.mortec.com/location.htm

I think you're right -- L05 350 -- it looks exactly like it (valve covers, I mean).

So, it's either one or the other:

http://paceperformance.com/i-6485019-12568758-5-7l-350cid-lo5-k-1987-1995-chevy-gmc-full-size-trucks-g-van-up-to-7200-gvw.html
or
http://paceperformance.com/i-6484911-12520270-5-7l-350cid-lo5-k-1987-1995-chevy-gmc-full-size-trucks-g-van-1996-2002-p-van-over-8600-gvw.html

I'll see if I can find the casting number, or just pull the oil pan -- it says that the 7200 gvw version is a 2-bolt main, and the 8600 gvw is a 4-bolt main.

Thank you so much!   

LO5 goes all the way back to 1987.  It's the first TBI 350. 
There are a lot more than two casting numbers.  Look behind the RH cylinder head where you found the 5.7L cast on the LH side.  The only way to verify a 4 bolt main block is to pull the oil pan.

Is there any way a mere mortal can get the reference book pages that tell what equipment the state sponsored emissions terrorists expect to see?  Or do they change the rules depending on the moon phase?

[plik]

Thanks everyone for your help.

Turns out I have this engine.

5.7L 350CID (LO5-K) 1987-1995 CHEVY & GMC FULL SIZE TRUCKS & "G" VAN - OVER 8,600 GVW



Specs on this engine are as follows:

 - 1986 and up 4 bolt main 1 piece crankshaft seal block(no mechanical fuel pump provision)
 - Nodular iron crankshaft
 - Powdered metal connection rods
 - Dished hypereutectic pistons
 - 8.75:1 Compression ratio
 - High volume oil pump
 - Morse link type timing chain

Camshaft specs as follows:

Flat tappet hydraulic camshaft
 - Intake lift .382"
 - Exhaust lift .402"
 - Intake duration @.050-165.9
 - Exhaust duration @.050-174.8
 - Lobe center separation - 111.9

Camshaft mechanical specs
 - Intake valve opens @ -30.2 BTDC * Intake valve closes @ 16.1ATDC * Intake lobe centerline - 111.8
 - Exhaust valve opens @ 18.1BBDC * Exhaust valve closes @ -23.3 ATDC * Exhaust lobe centerline - 111.8

Cylinder Head Specs:

 - Casting number 14102193
 - Swirl port intake port design
 - 76cc Combustion chamber
 - 1.94" Intake valve 1.50" Exhaust valve
 - Valve spring part number is 3911068 (same spring used with the old 300hp 350 crate engine)
 - Installed height 1.70" Pressure @ Installed height is 80 LBS * Pressure with valve open is 267 lbs.
 - These springs are good for .550" lift but clearance between guide and retainer must be double checked before attempting.
 - 7 Bolt exhaust flange
 - Center bolt valve cover flange
 - 1987-1995 Intake manifold bolt pattern with center intake bolts canted @ 72 angle