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depends on the bore and stroke of the engine.

The volum of a cylinder is: ∏r²*h

Aermacchi 350= 344

bore: 74mm

stroke: 80mm

radius (bore/2): 74/2=37

3,14...*37mm^2*80mm=344 067/1000 = 344

now reverse it:

396*1000/80mm/3,14...= √1575,63...= 39,694...*2 = 79,388mm

To make an Aermacchi Sprint a 396 you would have to bore out from 74mm to 79,4mm.

Now do the maths on your own engine.

Multi-cylinders? multiply number with cylinder-count (344 067/1000*4) and divide next (396*1000/4= 99000/80 etc

S.

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Q: How much do you bore out a 350 engine to make it a 396?
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