These are the known mechanical and performance specifications for your 1958–1963 Royal Enfield Fury.
Basic Specs

Engine
Displacement500cc/600cc
Typesingle
Details500cc/600cc single
Max RPM
Compression
Bore/Stroke
Valves/Cylinder
Fueling
Ignition
Exhaust
Lubrication
Cooling
Chassis
Frame Type
Rake
Trail
Front Suspension
Front Travel
Rear Suspension
Rear Travel
Seat
Seat Height
Alt. Seat Height
Total Height
Total Length
Total Width
Ground Clearance
Wheelbase
Dry Weight
Wet Weight
Wheels & Brakes
Front Tire/Tyre
Rear Tire/Tyre
Front Brakes
Front Brake Diameter
Rear Brakes
Rear Brake Diameter
Wheels
Comments
Post-war Production: Competition model built for US flat track competition market; it was essentially a Bullet 500 bottom end with a substantially larger cylinder head with integrated rocker box, larger ports and valves. The bike was nicknamed "Big Head". Came with 1.5" Amal GP carburetor and Lucas Racing Magneto. 193 ever made. One 600 cc prototype was made and sold per factory records. A "Big Head" bullet was sold in the UK concurrently for the civilian market with a smaller inlet valve and Amal Monobloc carburetor.