| | . By mapping the exact shape of a piston or cylinder head, optimum compression ... : Vertical holes in the deck of the piston, allows combustion pressure to directly ... amount of weight from the skirt of the piston while maintaining its strength and ... area against the cylinder wall when the piston rocks over . Contact reduction also ... Squirt Notch: Notching can be done on pistons for motors with oil squirters, or to ... avoid contact between pistons and/or pistons and crankshaft. (BO) Bottom Oilers: ... : Most commonly used on Hemi and motorcycle engines, this process leaves a raised ...
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