4.560" Bore Standard Deck
$3,995.00
In stock (9 available)
New Generation Dart BBC Fully Machined Block 2pc RMS
4.600" Bore Tall Deck [31223644-MACHINED]4.310" Bore Standard Deck [31223454-MACHINED]
New Generation DART BBC Bare Block w/ 2pc Rear Main Seal
THIS BLOCK HAS BEEN DECKED
It is fully machined and ready for prep work.
Dart Machinery has completely redesigned the Big M series Block.
They have incorporated numerous improvements and new features to virtually every area of the block.
We now use the New Generation Dart blocks in all of our BBC engine builds. The New Generation Dart block is light years ahead in overall construction as compared to any of the other blocks on the market. Dimensional specs are spot on, and this has been an issue with other blocks we have used in the past. Many of the top engine builders, ourselves included, have found the new Dart block to be superior to the earlier generation Big M series Dart block in many ways.
Note: This block is fully machined but will still require block prep work before use. This involves carefully grinding specific areas and chamfering the lifter bores, and installation of cam bearings, as well as extensive cleaning. All of this can be done with hand tools but requires extensive knowledge of the procedure. We offer a block prep package, and this includes the special cam bearings used in Dart blocks and the installation of them.
Dart blocks and heads are 100% 🇺🇸 American made and are subject to stringent quality assurance procedures to ensure superior quality and performance.
Features
- 2-Piece Rear Main Seal
- Finished Bore Ready to use (choose size)
- 9.800" (standard) and 10.200" (tall) deck heights available
- Standard BBC Camshaft Bearing Journal
- Standard BBC Lifter Bore
- Ductile Iron Main Caps
- High Density 220 BHN Iron Construction
- Priority Main Oiling
- Bores up to 4.625" max
- Accepts +.300" Tall Aftermarket Lifters
- Clearance for 4.375" Stroke - 9.800" Deck
- Splayed 4-Bolt Main Caps with Dowels & Stepped Register, Ductile Iron
- Lifter valley head stud bosses help prevent blown head gaskets
- Accepts Standard Big Block Chevy Components
- OE-style Fuel Pump & Starter Mounts
- Approximately 270 lbs
- Rated to 1000+ Horsepower
- Made In USA 🇺🇸
Dart Big M2 Iron Big Block Chevy Blocks
Dart engineered the Big M to be the strongest, most reliable, and easiest to build big block on the market. The Dart Big M2 is designed from the ground up as a true racing engine block which can be used with standard off the shelf big block components. The Big M2 is cast from premium high strength Iron and beefed up in all the critical areas. A competition oiling system ensures adequate lubrication to the main bearings at high RPM.
Standard 9.800” and tall 10.200” deck heights; Standard 4.250”, 4.500”, 4.560” or 4.600” bore sizes with siamesed extra thick cylinder walLS2 to resist cracking and improve ring seal (minimum .300” thick with 4.625” bore); Uses +.300” tall Gen VI style lifters. Modification for Gen IV style available; 4-bolt main bearing caps in steel or Ductile Iron have splayed outer bolts for extra strength; True priority main oil system lubricates the main bearings before the lifters.
Our stepped main oil gallery (9/16“ to 1/2“ to 7/16“) increases the flow of oil to the crank at high RPM, and our front oil crossover eliminates internal oil leaks around the distributor shaft; Lifter valley head stud bosses prevent blown head gaskets; Dual oil pan bolt patterns fit standard and notched oil pans; Parts kit is included.
Machine Work
The Dart block is bored and decked to size with our Centroid CNC touch probe machine.
Decking
We deck the blocks to an RA finish of . 15 or better . If a deck preference, let us know and we'll deck to your spec.
When we're finished decking the block, it is within approx. .001" accuracy from end to end. If you're thinking about using another shop, ask them about their accuracy.
Plate Honing
To finish the bores, we plate hone the block with our Sunnen SV15 diamond hone machine .
With this advanced machine we can hone the block with a superior finish for the best seal possible.
Attention Valued Customers!
When it comes to highly technical questions, our sales team at Skip White Performance might not always have the detailed answers you're looking for, especially on topics like installation procedures or tuning.
For those with detailed or specific questions, we strongly recommend checking out automotive forums and communities where these products are frequently discussed. These forums are a treasure trove of information and can provide the expert advice you need. Additionally, YouTube has countless tutorials and guides that walk you through the installation process and other technical details.
Please note: While we're here to provide top-notch products, we cannot be held responsible for any damage resulting from the use or installation of this product. Make sure to do your research and proceed with caution!
Thank you for choosing Skip White Performance!
Disclaimer
Skip White Performance is not liable for any collateral damage or incidental issues arising from the use or misuse of our products. High-performance parts are intended for experienced professionals and enthusiasts. Use at your own risk.Product Information
| UPC | 31213544-MACHINED |
|---|---|
| Product Type | Bare Block |
| Price (excl. tax) | $3,995.00 |
| Price (incl. tax) | $3,995.00 |
| Tax | $0.00 |
| Availability | In stock (9 available) |
| Block | BBC |
| Brand | DART |
| Shipping Cost | 250.0 |
| Bore | 4.56 |
| Deck Height | 9.8 |
| Material | 220 BHN Cast Iron |
| Camshaft Location | Standard |
| Main Bearing Type | Standard |
| Camshaft Lifter Bore | 0.842 |
| Freight Required | No |
| Number of reviews | 0 |
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