Dart Introduces New Big M2 and Little M2 Applications and Updated Part Numbers!

The popular Dart Big M2 and Little M2 block series have been updated and expanded to include several new-for-2020 applications as well as a plethora of updated part numbers.

Dart’s popular line of Big M2 blocks just got bigger and more competition focused, with five new part numbers. These new Big M2 block part numbers will feature 55mm roller cam tunnels, larger .904in lifter bores, doweled main caps and raised lifter oil galleries. These features represent the most demanded block upgrades requested by racers, now combined into convenient packages for easy ordering and to better meet our customer’s and builder’s needs. SEE BELOW FOR DETAILS

FEATURES:

  • Standard 9.800”, 10.200” and 10.400″ deck heights
    • Standard 4.250”, 4.500”, 4.560”, or 4.600” bore sizes with siamesed extra thick cylinder walls to resist cracking and improve ring seal (minimum .300” thick with 4.625” bore)
    • Available in .400” raised cam
    • Uses +.300” tall GEN VI style lifters. Modification for MRK IV style available
    • 4-bolt main bearing caps in steel or ductile iron have splayed outer bolts for extra strength
    • Lifter valley head stud bosses help prevent blown head gasket
    • Easy to install AN fitting oil gallery plugs

Updated Big M Block Part Numbers

Old/Superseded Part Number

New Part Number

Description

31273344

31223344

BBC Ir/Blk Sports 9.800-4.250 no kit

31273354

31223354

BBC Ir/Blk Sports 10.200-

4.250 no kit

31273444

31223444

BBC Ir/Blk Sports 9.800-4.500 no kit

31273454

31223454

BBC Ir/Blk Sports 10.200-

4.500 no kit

31273544

31223544

BBC Ir/Blk Sports 9.800-4.560 no kit

31273554

31223554

BBC Ir/Blk Sports 10.200-

4.560 no kit

31273644

31223644

BBC Ir/Blk Sports 9.800-4.600 no kit

31273654

31223654

BBC Ir/Blk Sports10.200- 4.600 no kit

31263344

31213344

BBC Ir/Blk 9.800-STD-4.250

31263354

31213354

BBC Ir/Blk 10.200-STD-4.250

31263444

31213444

BBC Ir/Blk 9.800-STD-4.500

31263454

31213454

BBC Ir/Blk 10.200-STD-4.500

31263544

31213544

BBC Ir/Blk 9.800-STD-4.560

31263554

31213554

BBC Ir/Blk 10.200-STD-4.560

31263644

31213644

BBC Ir/Blk 9.800-STD-4.600

31263654

31213654

BBC Ir/Blk 10.200-STD-4.600

.

2020 New Big M Block Part Numbers

Part Number

Description

31223345

BBC Ir/Blk S 9.800-4.250 no kit +.400 RC

31223355

BBC Ir/Blk S 10.200-4.250 no kit +400 RC

31223445

BBC Ir/Blk S 9.800-4.500 no kit +.400 RC

31223455

BBC Ir/Blk S 10.200-4.500 no kit +400 RC

31223545

BBC Ir/Blk S 9.800-4.560 no kit +.400 RC

31223555

BBC Ir/Blk S10.200-4.560 no kit +400 RC

31223645

BBC Ir/Blk S 9.800-4.600 no kit +.400 RC

31223655

BBC Ir/Blk S10.200-4.600 no kit +.400RC

31213345

BBC Ir/Blk 9.800-STD-4.250 +.400 RC

31213355

BBC Ir/Blk 10.200-STD-4.250 +.400 RC

31213445

BBC Ir/Blk 9.800-STD-4.500 +.400 RC

31213455

BBC Ir/Blk 10.200-STD-4.500 +.400 RC

31213545

BBC Ir/Blk 9.800-STD-4.560 +.400 RC

31213555

BBC Ir/Blk 10.200-STD-4.560 +.400 RC

31213645

BBC Ir/Blk 9.800-STD-4.600 +.400 RC

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An industry staple, the Dart Machinery Little M2  block line has been updated and broadened to include new features and more combinations of high-performance options perfect for your next build. SEE BELOW FOR DETAILS

FEATURES:

  • Deck heights include: 9.025″, 9.325″ and 9.500″
    • Bore sizes: 4.000″ and 4.125″
    • Available in .391” raised cam
    • Uses standard small block parts, including cam, oil pump, oil pan, oil filter, motor mounts, mechanical fuel pump, and clutch linkage
    • Center lifter oil crossover for improved lifter oiling
    • Enlarged lifter bosses accommodate offset and oversize lifters
    • Blind head bolt holes don’t go through to water jacket
    • Standard oil pan rail width
    • Easy to install AN fitting oil gallery plugs

.

Updated Little M Block Part Numbers

Old Part Number

New Superseded Part Number

Description

31151111

31191111

SBC Ir/Blk LM S 9.025-4.00-350

no kt

31151211

31191211

SBC Ir/Blk LM S 9.025-4.125-350

no kt

31152111

31192111

SBC Ir/Blk LM S 9.025-4.00-400

no kt

31152211

31192211

SBC Ir/Blk LM S 9.025-4.125-400

no kt

31131111

31181111

SBC Ir/Blk Little M 9.025-4.00-350

31131111LT

TBD

SBC Ir/Blk Lit M-9.025-4.00-350

Lighten

31131113

TBD

SBC Ir/Blk Lit M -9.025-4.00-350-

50mm

31131113LT

TBD

SBC Ir/Blk Lit M9.025-4.00-350-50

Lighten

31131211

31181211

SBC Ir/Blk Little M 9.025-4.125- 350

31131211LT

TBD

SBC Ir/Blk Lit M-9.025-4.125-350

Lighten

31131213

TBD

SBC Ir/Blk Lit M-9.025-4.125-350-

50mm

31131213LT

TBD

SBC Ir/Blk Lit M9.025-4.125-350-

50 Lighten

31132111

31182111

SBC Ir/Blk Little M 9.025-4.000- 400

31132113

TBD

SBC Ir/Blk Lit M-9.025-4.000-400-

50mm

31132211

31182211

SBC Ir/Blk Little M 9.025-4.125- 400

31132211LT

TBD

SBC Ir/Blk Lit M 9.025-4.125-400

Lighten

31132213

TBD

SBC Ir/Blk Lit M-9.025-4.125-400-

50mm

31132213LT

TBD

SBC Ir/Blk Lit M9.025-4.125-400-

50 Lighten

.

New Little M Block Part Numbers

Part Number

Description

31181115

SBC Ir/Blk Little M 9.025-4.000-350 RC

31181125

SBC Ir/Blk Little M 9.325-4.000-350 RC

31181135

SBC Ir/Blk Little M 9.500-4.000-350 RC

31181215

SBC Ir/Blk Little M 9.025-4.125-350 RC

31181225

SBC Ir/Blk Little M 9.325-4.125-350 RC

31181235

SBC Ir/Blk Little M 9.500-4.125-350 RC

31182115

SBC Ir/Blk Little M 9.025-4.000-400 RC

31182125

SBC Ir/Blk Little M 9.325-4.000-400 RC

31182135

SBC Ir/Blk Little M 9.500-4.000-400 RC

31182215

SBC Ir/Blk Little M 9.025-4.125-400 RC

31182225

SBC Ir/Blk Little M 9.325-4.125-400 RC

31182235

SBC Ir/Blk Little M 9.500-4.125-400 RC

.