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I have 8 Wiseco forged racing pistons that are used but in excellent condition , they have a .990 floating pin with the spirolocs , they are a big domed piston that will give you 13 to one compression ratio . they are setup to use the 6.800 rod with a 4.250 stroke and a 4.250 bore . Asking $650 plus shipping . You use the big block chevy rod that are easily available .