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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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