Which motor is this?

[marleyskater420 5,000+ posts]

no, its not considered a bb...

reayykky? da,mi thouht so. but imm too ducked fup to really ****

 

[Ignatowski 5,000+ posts]

409's are indeed considered Big Blocks.....The first really,then came the 396's,then 427s the 454s -

400 SBC are awsome when modded with longer rods,better valvetrains and

some compression.... but in GM form they sucked,and overheated alot due to the steam hole issue