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prestonw

Boring out a cylinder

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Hello- 

 

I am new to car restoration and mechanic talk, so i need a little bit of help.  A 72 nova I am thinking about purchasing has a small block 350 in it that was "bored out into 360 cu. in." motor. What does this mean???

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It means the engines cylinders have been machined out to a slightly larger diameter than original, over sized pistons and rings are then installed. The result is that the capacity of the engine is slightly increased, in your case to 360 cubes. This is done when rebuilding a worn engine.

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The block been bored .60 over, the maximum. .30 over = 355 cu. in. .40 over = 357. I would ask why such an overbore? Were the cylinder(s) that bad to necessitate it? I would not bore a 350 more than .40 over. IMO.

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