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B20E 140-160

posted by  Phil S. on  Tue Jun 30 05:48 CST 2009
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last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

One no brainer is to take the sides out to match the bore.

At .040 over, cylinder bore is 90mm and the chambers are already 92mm across.

Then make a little more clearance around the intake (unshrouding).

NOT outboard of the valves, which will actually hurt flow. The major squish area -- the flat edge opposite the spark plug -- can be cut back somewhat, as can the outer edges of the wedge the plug threads through.






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