SBF PowerPak F/T Piston Set 4.060 Bore -6.5cc 1971-avanti-ii-esi6178202 but how do you swap

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SBF PowerPak F/T Piston Set 4.060 Bore -6.5cc 1971-avanti-ii-esi6178202 but how do you swapPiston and Ring PowerPak Forged Flat Top 4. 060 in Bore 1. 090 in Compression Height 1. 0 x 1. 0 x 2. 0 mm Ring Groove Minus 6. 50 cc Small Block Ford Kit