Dart Big M Sportsman Big Block Chevy Cast Iron Bare Blocks

The foundation for a better big block build begins with Dart Big M Sportsman Big Block Chevy cast iron bare blocks. Dart engineered the Big M to be the strongest, most reliable, and easiest to build big blocks on the market.

The Dart Big M Sportsman blocks feature:

* Standard 9.800 in. and tall 10.200 in. deck heights available for Stroker engines
* Standard 4.250 in., 4.500 in., or 4.600 in. bore sizes with Siamesed extra thick cylinder walls to resist cracking and improve ring seal (minimum .300 in. thick with 4.625 in. bore)
* Uses +.300 in. tall Gen VI style lifters. Modifications for Gen IV style are also available
* Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures
* 4-bolt ductile iron main caps have splayed outer bolts for extra strength
* True priority main oil system lubricates the main bearings before the lifters
* Oil filter pad is drilled and tapped for an external oil pump
* Lifter valley head stud bosses prevent blown head gaskets
* Rear main cap uses standard oil pump and two-piece seal, no adapter required
* Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in chassis
* Dual oil pan bolt patterns fit standard and notched oil pans
* Coated cam bearings, freeze plugs and dowels not included

Main Journal Type:
Chevy 454
Engine Block Material:
Cast iron
Engine Block Style:
OEM
Engine Block Deck Height:
Standard deck
Deck Height (in.):
9.800 in.
Cylinder Bore as Shipped:
4.590 in.
Cylinder Bore Diameter:
4.600 in.
Engine Block Weight (lbs.):
250 lbs.
Main Bolt Style:
4-bolt
Main Caps Included:
Yes
Main Cap Material:
Ductile iron
Main Cap Fasteners Included:
Yes
Main Bearings Included:
No
Rear Main Seal Style:
2-piece
Finished Cylinder Bores:
No
Raised Cam Location:
No
Cam Bearings Included:
No
Freeze Plugs Included:
No

The post Dart Big M Sportsman BBC 4.600″ 9.8 Deck Cast Iron Bare Block 31223644 appeared first on ATK High Performance Engine.

Designed for high performance and medium duty applications, the SHP LS Next Block is the ideal starting point for hot rodders, drag racers, circle track competitors, off-roaders and high performance marine enthusiasts.

FEATURES
Dart priority main oiling system with provisions for stock oil filter mounting.
Full skirt design.
Accepts factory and aftermarket oil pans.
Siamesed cylinder bores with thick walls.
Cylinder barrels extended 0.375″ at the bottom of the bores.
Thick decks ensure reliable head gasket seal.
Blind head bolt holes available in 7/16″ or 1/2″.
6-bolt per cylinder capability.
Scalloped water jackets increase flow around cylinders for better cooling.
Clearanced up to 4.100″ stroke with steel rods.
Clearanced for center counterweighted crankshafts.
Splayed outer bolts on middle main bearing caps.
Provisions for LSX roller lifters and cam.
Uses OE front and rear covers.
All OE bolt holes for starter, water pump, etc.
Windage trays.
Parts kit included (PN: 32000018).

Deck Height: 9.240″
Cylinder Bore: 4.125″
Cylinder Bore Max: 4.185″
Main Bearing Size: Stock LS
Main Cap Material: Steel
Main Caps: 4-Bolt 1-5
Cam Location: Stock 55mm
Lifter Bores: Stock 0.842″ Diameter
Rear Seal: Standard

The post ATK Machined Dart LS Next Cast Iron Bare Blocks 31867211 appeared first on ATK High Performance Engine.

ATK blocks are stroker clearanced and will come with the cam bearings and brass freeze plugs installed. 

Engine Specifications:

• Block: 100% New Bare Block with 1pc Rear Main Seal
• Bore: 4.000” (4.0003-4.0008”- Pistons size vary, final honing may be required)
• Maximum Bore: 4.060” recommended
• Displacement: 350CI
• Main Journal Type: Chevy 350
• Engine Block Material: Premium Iron Alloy
• Engine Block Style: Aftermarket, based off the Vortec 350 Roller Block
• Engine Block deck Height: Standard Deck
• Engine Oiling System: Priority Main
• Fuel Pump Boss: Yes
• Main Bolt Style: 4 Bolt
• Main Caps Included: Yes
• Main Cap Material: Cast Iron
• Main Cap Fasteners Included: Yes
• Main Bearings Included: No
• Camshaft Bearings: Dura-Bond, installed and clocked to OEM position
• Freeze Plugs: Brass, installed and sealed
• Oil Galley Plugs: Installed and sealed
• Roller Camshaft Compatible: Yes
• Stroker Clearanced: Yes, but the assembler must always check as components differ.

Block Specs:
Camshaft bearing line boring in STD. (1.8705” – 1.8710”)
Main, line honed (2.6408” – 2.6415”)
Cylinder honing ID: (4.0003-4.0008”)
Minimum deck height (9.014”)

Disclaimer: The recommended components listed are ATK’s recommendations of parts to be used, applications vary and your build may need something different. Contact ATK for a recommendation if you are not certain about a component to use. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts.  ATK reserves the right to substitute parts used in engines if necessary.

The post ATK #13ZB 350CI Bare Block Machined & Ready to Assemble appeared first on ATK High Performance Engine.