Re: model B piston clearance in the block
The clearance is measured at the points cross wise in the engine (side to side not fore and aft). The pistons are ground eccentric so that the clearance fore and aft is greater. This allows for expansion of the piston. That applies to a piston with a full skirt. The clearance in the side to side direction will be about 0.004.
For pistons that are ground round (don't use these) the clearance is greater, perhaps 0.010. For pistons that have only a partial skirt (slipper pistons), like Egge pistons, the clearance can be less, and I don't know what it should be.
As Pete said, use the recommendation of the piston manufacturer. If not supplied with the pistons, contact them to get their recommendation.
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