"The main points repeated"
Z18 and L18 are 46-50kg bare block the guy wants lighter
not heavier engine otherwise its obvious what else is avail

I meant 2mm over to 85mm like L18 I stand corrected.

"L20B crank into L16 block is no rocket science it has
been done to death" quoted from master Baz.

The mob Ive used in the past for all my machine work
Squared Line boring L16 block for L20 crank and
Machined counterweights with re-balancing $350-400
or machine crank mains to suit L16 inc hardening
plus all the rest eg balancing linishing $350
Fully Prepped L16 rods $160-180
Z20e pistons 180-200 new

rod stroke ratio of 1.543 same as honda K20 or B16