Help in IDing this block please

[Brads70]

A buddy of mine needs help to ID this block? I figured someone on here will know!

[Bullitt-]

couple of searches came up   2780930   1968-1973   340   LA

from this resource https://m.roadkillcustoms.com/mopar-engine-block-numbers/

[Brads70]

couple of searches came up   2780930   1968-1973   340   LA

from this resource https://m.roadkillcustoms.com/mopar-engine-block-numbers/

I don't think it was a production block due to the Mopar logo in the casting?   Maybe some kind of reproduction replacement block?   It's brand new, never used.

[MoparCarGuy]

It appears to be a Mopar Performance replacement 340 iron block with the four-bolt main caps. Many variations and part numbers. Start by checking the bore diameter and post pictures of the lifter valley, the front, and the cylinder head deck area to help narrow it down. Below descriptions of replacement blocks.
Hopefully someone else can elaborate on the casting number. The "P" numbers for the blocks below were cast into the side versus the 2780930 on your block. Example shown.

SMALL BLOCK HP MAGNUM &"LA" BLOCKS
Magnum and "LA" Blocks are designed for general high performance use and entry level racing. Ready for assembly without the need for any additional machining. Bored and honed to standard bore size. Camshaft Bearings and freeze plugs installed in block. Hardware kit included. Ductile Iron Main Caps with ARP bolts (four-bolt on the center three caps). Dual motor mounts with "LA" and Magnum mounts (must use late 1970s 318 mount for left side). Heavy duty casting with thicker deck and bore walls. Works with all stock-style engine components. P5153452 & P5153579 work with Magnum stock-style Hydraulic Roller Camshafts (required tappet retainer kit P5155275). Not recommended for use with aftermarket tie bar style mechanical roller tappets. Siamese Bore (all except P5007552AB) allows up to 4.220" bore size. Standard deck height - 9.600". Setup for wet sump oiling system with oil drain holes in the valley. Magnum blocks can also be used for "LA" applications with dual oiling system provisions (LA oil passages to heads or Magnum oiling through pushrods, and flat tappet or hydraulic roller cams). MPI provisions for Magnum crank trigger. 59° Tappet Bore works with all stock-style cylinder heads and camshafts. P5153579 requires use of 318/340 "LA" oil pan (stock 5.2L Magnum oil pan will not fit).
P5153478AB   Block, Cast Iron, 340 Replacement, Siamese-bore, 4.040" Finished Bore
P5153743       Block, Cast Iron, 340 Replacement, Siamese-bore, 4.175" Rough Bore
P5007552AB   Block, Cast Iron, 340, Non-Siamese-bore, 4.040" Finished Bore
P5153908       Block, Short Assembly, 4.040" Bore, 3.310" Stroke, 340 "LA"

SMALL BLOCK CAST IRON "R3" RACE ENGINE BLOCKS
Building on our heritage, the R3 race block family offers the latest in design technology along with the options to meet your specific needs. All of these blocks feature:  Process-controlled castings utilizing high-strength cast iron and a computer-controlled stress relieving process, 100% CNC machining with full statistical process control, Thick deck surface and six-bolt cylinder head attachment (48° blocks) for improved sealing and reliability, Various options that provide deck height potentials of 8.900" to 9.600", Tappet angles in both 59° (stock) and 48° are available (improved valve train geometry) (59° blocks are not recommended for use with roller tappets), Thicker main webbing and pan rail for improved rigidity, Four-bolt mains in ductile iron, billet, 318/340 main journal size, Machined for "LA" or Magnum head oiling, as well as engine mounts.

[Bullitt-]

found this  "Around 2000, Mopar Performance started offering a 340 restoration block that not only had the thick bulkheads of the 1970 T/A block, but also had actual four-bolt mains on the center three mains. It used the same casting number as the original 340"

https://www.mopardiy.com/how-to-build-mopar-engines-for-performance-the-block-guide/

[MoparCarGuy]

Bullitt- found it.
"Around 2000, Mopar Performance started offering a 340 restoration block that not only had the thick bulkheads of the 1970 T/A block, but also had actual four-bolt mains on the center three mains. It used the same casting number as the original 340 T/A with a 340-M added"

[Brads70]

    Thanks Wade!

[Brads70]

Any idea as to the value?  Guy thought it was a T/A/AAR block but its not.

[gzig5]

Somewhere above $2k and below $4k, IMO.  Those are nice blocks with thick bores and main webs, and can handle more HP than a standard block. X and R blocks I've seen lately have all been over $3k.  That's a great find, depending on the price.

[RUNCHARGER]

Nice piece.

[Chryco Psycho]

That is a killer block , it has the bosses for the extra head bolts even though they are not drilled so it can be used as an R3 block using the W7-W8-W9 6 bolt / cylinder heads . Built properly that can make well over 800 HP .
I would grab it if you can !

Wait , your block has the extra bosses milled off , Wades pix show the outer bosses intact . Nevermind on the W series heads & 800+ hp