It really depends on the manufacturer and who's doing the work. Usually Stage 1 means mild work, Stage 11 usually means little more aggressive porting/polishing, and stage 111 is usually the baddest port/polish job you can get for that head. Heads aren't hard to install. Just be sure to torque them down to the correct specs.
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68 Camaro
Gene Fulton 632ci Two stages of Jug
8.41 164mph Rockingham 1-26-03
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