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440 Source isn’t kidding with its claim that the 512 stroker kit “drops right in” with minimal clearance work. The pencil points out the only place where clearance grinding was required to let the No. 1 rod pass by the oil-pickup tube boss. Naturally, every customer must confirm similar luck on his particular block. All clearance grinding must be performed during exploratory mock-up assembly steps. After, everything must be disassembled and cleaned to remove any debris prior to final assembly.