well the main way to tell is by the grill also, 77's look like a honeycomb, while 78's are diagonals, like diamond shapes almost. thats how i tell
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FAA Airframe and Powerplant Mechanic - Republic Airlines
-1980 Trans Am ZZ383 stroker
-2012 Ford Focus 5spd
-1989 Harley Softail Custom
-2000 Trans Am, M6, WS6 *SOLD* *RIP*
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