The heads are being put on now

It runs, and no ping but compression is down was @180 -185 NOW IS 170 -175 , runs on 91 , maybe even 89 octane , but I wanted max compression with the alu heads it's at 9.9:1 now should have at least 10.5+ with the alu heads , not happy with results . Winter is long , lot of time to save $$ and get it right . We made a mistake with the heads that needs correcting , just can't leave it as is , untapped potential .