MD80 LNDG SFO ON RWY 28L RECEIVED THRUST BLAST FROM A B-747 HOLDING BTWN RWYS 28L AND RWY 28R. IT ALSO APPEARED TO THE LNDG PLT THAT THE B-747 WAS NOT COMPLETELY CLEAR OF RWY 28L.

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WE WERE CLRED TO LND ON 28L AND INFORMED THAT AN ACFT WOULD BE XING 28L BEFORE OUR ARR. ON SHORT FINAL WE REALIZED THAT THE ACFT A 747 WAS NOT COMPLETELY OVER THE HOLD SHORT LINE FOR 28L. THE TAIL WAS OVER THE LINE AND THE NOSE OF THE ACFT WAS WELL SHORT OF THE HOLD SHORT LINE FOR 28R. THE CTLR APPARENTLY DID NOT SEE THIS AND NO WARNINGS WERE GIVEN. THE TAIL WAS WELL OFF THE RWY AND I JUDGED THAT CLRNC WAS ADEQUATE AND SAFE. I BELIEVE THE B747 PLT REALIZED THAT HE WAS NOT FAR ENOUGH FORWARD AND MAY HAVE ADDED THRUST TO MOVE UP. JUST AS WE WERE XING BEHIND HIM WE CAUGHT A PRETTY GOOD WAKE OR JET BLAST. I WAS ABLE TO MAINTAIN CTL AND LANDED ALTHOUGH IT WASN'T PRETTY. AFTER PARKING I CONTACTED THE SFO TWR AND DISCUSSED THE EVENT WITH THEM AND POSSIBLE WAYS TO AVOID SIMILAR OCCURRENCES IN THE FUTURE. IT MIGHT BE CONSIDERED A TECHNICALITY WITH A TAIL JUST OVER THE HOLD SHORT LINE BUT I THINK IN THE FUTURE I WILL JUST GO AROUND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAYS AFTER ARRIVING AT THE TERMINAL HE CALLED THE TWR SUPERVISOR TO DISCUSS THE INCIDENT. THE RPTR WAS TOLD THAT NOTHING UNUSUAL WAS NOTICED BY THE LCL CTLR AND THAT HOLDING LARGE ACFT BTWN THE RWYS IS A FAIRLY COMMON PRACTICE.