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By reducing the size of the big-block Ford's factory 2.500-inch crank pins to 2.200 inches, the Scat crankshaft is compatible with big-block Chevy connecting rods. These measured out at 6.700 inches. Despite hanging from long rods, the pump-gas-friendly Probe SRS 10.9:1 pistons still retain a reasonable 1.450-inch compression height, thanks to the Ford's generous deck height. Most shelf pistons are offered in both 0.030- and 0.080-over diameters.