Accurizing via blueprinting

[RJW NZ]

When I used to play with cars there was a racing class that only allowed the engines to be kept to as issued, no changes other than original specs. To that end we would find the lightest piston and rods and makes them all weigh the same, and do a bunch of other invisible changes that upped the power right through the engine, and all within specs.
Is there a text, or has there ever have been any time devoted to accurizing enfields within as issued specs?

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[Alan de Enfield]

When I used to play with cars there was a racing class that only allowed the engines to be kept to as issued, no changes other than original specs. To that end we would find the lightest piston and rods and makes them all weigh the same, and do a bunch of other invisible changes that upped the power right through the engine, and all within specs.
Is there a text, or has there ever have been any time devoted to accurizing enfields within as issued specs?

A couple of books that may help :

a) The Lee Enfield Rifle - Reynolds
b) Competitive Rifle Shooting - James Sweet (The accepted text book on target shooting and bedding of target rifles)

[Simon P]

Book: "Target Rifle shooting" published 1972 by Reynolds & Robin Foulton has sections on bedding & regulating Lee Enfields