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BigM MrkIV GENV GENVI

Big M MRK IV, GEN V, GEN VI

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Product Description

Engineered for applications where water between the bores is a requirement. Siamese bore versions are also available for larger bore applications.

MRK IV blocks use the 2-piece rear seal design, and Gen V and Gen VI blocks use a 1-piece rear seal as well as a different timing cover pattern.

These blocks are based on Dart’s Big M design, and include features like priority main oiling and 4-bolt main caps.

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• Standard 9.800” and tall 10.200” deck heights available.

• Standard 4.250”, 4.310”, 4.500” and 4.600”.

• Uses +.300” tall Gen VI style lifters. Modification for Gen IV style available.

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

• Lifter valley bosses for OE style roller lifters and retainer.

• Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.

• Parts kit sold separately (PN 32000002)

Big M MRk IV Water – Iron

31243244 – Ductile Std. Std. 9.800 4.310 2-Piece

31243254 – Ductile Std. Std. 10.200 4.310 2-Piece

31243344 – Ductile Std. Std. 9.800 4.250 2-Piece

31243354 – Ductile Std. Std. 10.200 4.250 2-Piece


BIG M MARK IV WATER 396 Style Block – Iron (Legal for Super Stock)

31262044 – Ductile Std. Std.   9.800 4.094


Big M Gen V Water – Iron

31243344V – Ductile Std. Std. 9.800 4.250 1-Piece

31243354V – Ductile Std. Std. 10.200 4.250 1-Piece

31243244V – Ductile Std. Std. 9.800 4.310 1-Piece

31243254V – Ductile Std. Std. 10.200 4.310 1-Piece


Big M Gen VI Water – Iron

31243344VI – Ductile Std. Std. 9.800 4.250 1-Piece

31243354VI – Ductile Std. Std. 10.200 4.250 1-Piece

31243244VI – Ductile Std. Std. 9.800 4.310 1-Piece

31243254VI – Ductile Std. Std. 10.200 4.310 1-Piece


Big M Gen V Siamese Bores – Iron

31273344V – Ductile Std. Std. 9.800 4.250 1-Piece

31273354V – Ductile Std. Std. 10.200 4.250 1-Piece


Big M Gen VI Siamese Bores – Iron

31273344VI – Ductile Std. Std. 9.800 4.250 1-Piece

31273354VI – Ductile Std. Std. 10.200 4.250 1-Piece

31273444VI – Ductile Std. Std. 9.800 4.500 1-Piece

31273454VI – Ductile Std. Std. 10.200 4.500 1-Piece

BBC MARK 4 WATER Block InformationPacket – B16

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