engine help...

[Moutinho]

Hi guys, i have a complete m20b20 and i aquired a m20b25 block. is it possible use the b25 block with the b20 head with the solex 4a1 carb?
I don´t know much about mechanics...

[luke]

I think the normal B25 pistons won't work as they're designed specifically for use with the 325i (or "885") head casting.

A 2.7 crank, pistons and rods will work in that block with the 320i head and give you a high revving eta engine.

With the carb on it, it will run out of puff at around 5500RPM, but will be an absolute rocket up till then.