i was at a friends wedding yesturday. from the church to the reception all the car club members were goofing around with our cars. i did and i shifted into second gear at about 5600 rpms on my autometer tach. and i heard a really loud backfire. i let off and continued to the recption. while there the groom asked me to do some crowd entertainment, so i did a nice decent line lock. i maintained the revs around 4500 rpms. i parked the car and let it idle for about a minute or 2 before shutting it off. later that night i drove home and the car was running rough and hot. i instantly thought maybe i blew the headgasket. i felt like i was running on 7 cylinders. i drove it about 7 miles. this morning i went out to inspect the damage. Radiator- empty. oil very thin, but no milkshake look, just very very runny. do you guys think i blew a headgasket or what else could i have done? can someone recommend a brand and part number?