You gotta love peoples "car knowledge"

greenhornet said

The 400 i'm talking about is a small block, chevy never made a "400" big block...

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I know about the 400 small block, but they did make the 402, like Toolman said. I have one sitting in my shop ready to go into a 72 c10 shortbed factory 402 truck that has "400" emblems on it from the factory.