mrep32u

i have a ho-bao with a mac-star .28 motor. is this considered a big block???

pinky2252s

iTrader: (4)

im pretty sure that .28 and higher is big block

racinmason

iTrader: (9)

I believe any engine .21 and bigger is considered a big block.

cracka

since few nitro classes allow engine options, other than truggy that allows for a .21 or a .28 it would seem that a .28 is the answer

Duster_360

iTrader: (21)

Big block was anything that needed the big block engine mounts til companies started squeezing 21s and bigger onto small block enigine mounts.

Whether its 21 or 28, seems like your mac-star .28 motor is a big block.