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QUALITY STRENGTH PERFORMANCE SINCE 1981<br />

MRK IV blocks use the 2-piece rear seal design. Gen V and Gen VI<br />

blocks use a 1-piece rear seal as well as a different timing cover<br />

pattern.<br />

These blocks are based on Dart’s Big M design, and include features<br />

like priority main oiling and 4-bolt main caps.<br />

FEATURES<br />

• Standard 9.800” and tall 10.200” deck heights available.<br />

• Standard 4.250”, 4.310”, 4.500” and 4.600”.<br />

• Uses +.300” tall Gen VI style lifters. Modification for Gen IV style available.<br />

• 4-bolt main bearing caps in Ductile Iron have splayed outer bolts for extra strength.<br />

• Lifter valley bosses for OE style roller lifters and retainer (GEN VI only).<br />

• Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify<br />

installation in any chassis.<br />

• Parts kit sold separately (PN 32000002 - see page 118).<br />

BIG M MRK IV WATER (NON-SIAMESE) - IRON<br />

PART NO. CAPS MAINS CAM DECK BORE REAR SEAL<br />

31243244 Ductile Std. Std. 9.800" 4.310" 2-Piece<br />

31243254 Ductile Std. Std. 10.200" 4.310" 2-Piece<br />

31243344 Ductile Std. Std. 9.800" 4.250" 2-Piece<br />

31243354 Ductile Std. Std. 10.200" 4.250" 2-Piece<br />

BIG M MARK IV WATER (NON-SIAMESE) 396 STYLE BLOCK - IRON (Legal for Super Stock)<br />

31262044 Steel Std. Std. 9.800" 4.094"<br />

BIG M GEN V WATER (NON-SIAMESE) - IRON<br />

31243344V Ductile Std. Std. 9.800" 4.250" 1-Piece<br />

31243354V Ductile Std. Std. 10.200" 4.250" 1-Piece<br />

31243244V Ductile Std. Std. 9.800" 4.310" 1-Piece<br />

31243254V Ductile Std. Std. 10.200" 4.310" 1-Piece<br />

BIG M GEN VI WATER (NON-SIAMESE) - IRON<br />

31243344VI Ductile Std. Std. 9.800" 4.250" 1-Piece<br />

31243354VI Ductile Std. Std. 10.200" 4.250" 1-Piece<br />

31243244VI Ductile Std. Std. 9.800" 4.310" 1-Piece<br />

31243254VI Ductile Std. Std. 10.200" 4.310" 1-Piece<br />

BIG M GEN V (SIAMESE) - IRON<br />

31273344V Ductile Std. Std. 9.800" 4.250" 1-Piece<br />

31273354V Ductile Std. Std. 10.200" 4.250" 1-Piece<br />

BIG M GEN VI (SIAMESE) - IRON<br />

MRK IV<br />

GEN V<br />

GEN VI<br />

SIAMESE AND NON-SIAMESE<br />

QUICK INFO >>><br />

Engineered for applications where water between<br />

the bores is a requirement. Siamese bore versions are<br />

also available for larger bore applications.<br />

31273344VI Ductile Std. Std. 9.800" 4.250" 1-Piece<br />

31273354VI Ductile Std. Std. 10.200" 4.250" 1-Piece<br />

31273444VI Ductile Std. Std. 9.800" 4.500" 1-Piece<br />

31273454VI Ductile Std. Std. 10.200" 4.500" 1-Piece<br />

BIG BLOCK CHEVY<br />

CAST IRON ENGINE BLOCKS<br />

MRK IV, Gen V and Gen VI blocks with water<br />

between the bores are identified by a B suffix on<br />

the casting number.<br />

MK IV, GEN V & GEN VI SPECS<br />

Material: High Nickel 220<br />

BHN Cast Iron<br />

Deck Height: 9.800” 10.200”<br />

Cylinder Bores 4.250” to<br />

Non-Siamesed: 4.350” (max)<br />

Siamesed: 4.500”<br />

Main Caps: Ductile<br />

Cam Location: Standard<br />

Lifter Bores: Standard<br />

Freeze Plugs: Press fit<br />

Rear Seal:<br />

1 or 2-Piece<br />

Weight:<br />

250-280 lbs.<br />

SHORT BLOCKS TOP KITS BLOCKS HEADS MANIFOLDS CRANKSHAFT ACCESS SBC LS BBC SBF HON COATINGS BILLET<br />

Not intended for sale or use with pollution controlled vehicles.<br />

248.362.1188 / DARTHEADS.COM Connect with us socially, search: DART MACHINERY<br />

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