I do think this is the most powerful destroked SB Chevy engine that can be made . It starts out with a 400 block . then a L/J ( 327 Crank ) With it's 3.250 Stroke . Install it in the block using TRW# MS3063P Thick-wall main bearings . And a set of 5.700" L/J Rods . With a set of TRW#L2418F Domed Pistons that will give a C/R of 12.5.1 with 64cc heads . Now you will have a ( 348ci SB ) or with a .030 over-bore a ( 352ci SB ) . COOL The TRW#s can be crossed .