Bam block

Pretty much any engine will fit with deep enough pockets lol
 
BAM IS NOT forged, the crank is the same as any 06a style internal water pumped engine and the rods are identical to the 20mm ones you already have
 
^^ this

The Pistons are forged however
 
no more forged than what he has, exactly the same procedure goes into all 1.8t pistons manufactured by Mahle