Book excerpt: A complete practical guide on how to get more power with reliability from Harley's Evolution V-twin engine without wasting money on modifications that don't work and over-specced parts. Includes cylinder head planing and porting; valves, valve springs and valve seats; carburetors, camshafts and followers; crankshaft; connecting rods; pistons; engine balancing; flywheel; main bearings - and much, much more.