I googled your part # and searched at summit racing. Google shows it as maybe a TRW forged piston. Summit Racing as TRW/Speed Pro forged piston. Sounds favorable if that is the case. I would start with TRW/Speed-Pro tech support. Good luck.
__________________ 2006 Mustang GT, 76mm Turbo Kit, Diablo Mafia, 3:73 Gears, Flowmaster Mufflers, Steeda Sport Springs, Pro Action Struts, Upper Strut Mounts, X5 Balljoints, Bumpsteer Kit, Eibach Sway Bar Kit, Edelbrock Panhard Bar, Foose Nitrous Wheels, GT500 Wing, CDC Chin Spoiler, CDC Blackout, SOS Pillar Pod, Auto Meter Sport Comp II gauges, Steeda Billet Lower Control Arms, Steeda Adjustable Upper Link, Spydershaft Aluminum DS, BMR Safety Loop. | 
what pistons do I have 
