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they usually are a pretty smooth finish. ive never seen a small block chevy use a gasket between the oil pump and block. maybe some one can chime in on that. the 400sb maybe different.
 

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No gaskets. Never have had a gasket on any small block Chevy. The tiny bit of oil that may get buy goes right back in the pan.
 

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No gasket needed.

Just put a 400 small block togother.Has good oil pressure.Doesn't have a gasket.

The 400 is the same as other small blocks.....
 

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No gasket. Torque bolt to 55 ft/lbs
 
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