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Old/Superseded Part Number |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 |
.