I will buy an engine from a guy that put P073-a0 piston in his b16a first gen
and he told me that give higher compression: i am sure that it's false it suppose to drop the compression ratio to 9.7:1...
Wath are the disavatage to run these piston in a b16a and what the advantage...?

ok: lower comp/rat = turbo setup
higher = N/A

But is there someting to know about these piston that could change my idea to buy this engine.

Thanks

 

comparing them to pr3's, yes he lost compression.
compression with p73's will be about 10.06. p73's have more compression height than pr3's ( p73's are about .01 higher) and using .026 compressed head gasket height.